ASVAB Word Knowledge study guide

What this subtest actually asks of you

Word Knowledge is 15 of the 135 scored questions on the computer ASVAB — 11% of the scored test — and it is one of the four subtests that produce your AFQT score (how the ASVAB is scored). The official subtest description frames it as understanding the meaning of words through synonyms, and that is what the questions do: you get a word and pick the choice closest in meaning to it. Two forms turn up — the word on its own, and the word inside a sentence. When there is a sentence, read it first: it tells you the direction even when the word itself is unfamiliar.

Two things follow from that, and they decide how to study it:

• It is a recall test with a finite vocabulary behind it — not the whole dictionary, but the general, careful-reader vocabulary of ordinary prose. There is no procedure to apply to a word you have never seen; there is only the ability to place it.
• The wrong answers are chosen to be near misses. They are real words with related meanings, or the right meaning in the wrong part of speech, or the opposite of the word being asked about — opposites are a common distractor, so a choice that reads as a straight reversal deserves a second look. Most points are lost to the near miss, not to ignorance — which means a good deal of this subtest is winnable with vocabulary you already have.

How to attack a word you don't know

This is the method for the moment you read the word and draw a blank — which is the whole game on this subtest.

1. Cover the choices and make your own gloss first. Even a vague one: "something to do with not wanting to." Naming your own sense of the word before you read four options keeps the options from defining the word for you.

2. Take the word apart. Prefixes, roots and suffixes carry most of the meaning in long words:

• Prefixes — un-, dis-, in-/im-/il- (not); re- (again); pre-/post- (before/after); sub- (under); trans- (across); inter- (between); bene-/mal- (good/bad).
• Roots — -dict- (say), -script-/-scrib- (write), -spect- (look), -port- (carry), -ject- (throw), -luc-/-lum- (light), -cred- (believe), -voc- (call), -ten-/-tain- (hold).
• Suffixes — -ous/-ful (full of), -less (without), -ity/-ness (the state of), -ize/-ify (to make), -ate (to do or make).

That is the short version. The full table is further down this page — every part worth learning, the words each one turns up in, and the three cases where taking a word apart will not help you.

3. Use the sentence around it. The context usually tells you the direction — good or bad, more or less, willing or unwilling — even when it does not hand you the meaning. Direction alone often removes two choices.

4. Eliminate the pair that means the same thing. If two choices are near-synonyms of each other, they are almost always both wrong: a multiple-choice question cannot have two right answers, so a near-identical pair tells you where the distractors are. When the word sits inside a sentence, treat this step as a weaker signal — the sentence may echo the target word itself, so read the sentence before you start weighing the pair.

5. Check the part of speech, then the intensity. A noun where the sentence needs an adjective is wrong however good it sounds. So is a near miss of the wrong strength: frugal is not stingy, and terse is not curt, even though each pair sits on the same idea.

The order matters: your own gloss, then word parts, then context, then elimination. Elimination is last because it is the only step that depends on the choices being wrong in a helpful way.

Every word part, on one table

A prefix goes in front, a root carries the idea, a suffix goes on the end — and between them they decide most of what a long word means. Each line below is a card: the part on one side, its meaning on the other. Learn them the way you learn the vocabulary further down this page, a few a day rather than all at once.

Prefixes — what goes in front

Roots — the idea in the middle

The root is the part worth the most, because it is the piece that carries the idea. Two or three of them explain a whole family of words.

Suffixes — what goes on the end

A suffix decides the part of speech as well as the meaning, and step 5 of the method above is exactly this: a noun ending where the sentence needs an adjective is wrong however good it sounds.

And when it works, it works completely. inevitable is in- (not) + -able (able to be) + evit- (avoid): not able to be avoided. One word, three parts, and you have the meaning without ever having learned the word — which is what makes the table worth the memorizing.

Three ways this table will fail you

• Not every long word splits cleanly. impede looks like "not" + "foot" and is neither; scrutinize hands you an ending (-ize, an action) and nothing about which action. When the parts give you nothing, go to steps 3 and 4 — context, then elimination. Worked example 1 below is that exact case.
• A part narrows the neighborhood, not the meaning. -ous says "full of something" and never says what: meticulous, cautious and vociferous are all "full of" an entirely different thing. Worked example 2 is that case.
• The same part in two words can point two ways. inject, reject and project all carry -ject- (throw) and mean three different things, because the prefix is doing the directing. Use the parts to get close, then let the sentence and the choices finish the job.

Five words, worked through

Each of these is a question family from this topic's practice set. What follows is not the answer — it is the walk from "I don't know this word" to "I can pick it anyway".

1. IMPEDE

Choose the word closest in meaning to IMPEDE. — Assist · Hinder · Hasten · Ignore

• Own gloss first: something to do with getting in the way, being an obstacle.
• Parts: the prefix im- usually means not, but "not-pede" is not a thing — so this word has to be placed by direction and elimination instead.
• Elimination: Assist and Hasten both point the same way (helping, or speeding something up); Ignore is the odd one out but neutral.
• The trap: Hasten. It is the opposite of impede, and opposites are a common distractor. Knowing a word's direction is often enough to win the question.

2. METICULOUS

Choose the word closest in meaning to METICULOUS. — Speedy · Careless · Thorough · Doubtful

• Own gloss: about attention, and a lot of it.
• Parts: the suffix -ous means full of, so this is "full of … meticulous". Not much help — go to intensity instead.
• The trap: Speedy. Meticulous work is usually the opposite of fast. The near miss here is a real association — detailed work takes time — mistaken for a meaning.
• Also in play: Careless. The opposite of careful, which meticulous work never is.

3. CANDID

Choose the word closest in meaning to CANDID. — Frank · Rude · Hidden · Wealthy

• Own gloss: saying what you actually think.
• The trap: Rude. A candid remark can be perfectly polite; rude is about manners, not honesty. "Related but not the same" is a common near miss on this subtest.
• Note Hidden — it is the opposite, and opposites are a common distractor.

4. The same word, met inside a sentence

Choose the word closest in meaning to EXPAND as it is used in this sentence: "The gas inside the balloon will expand as the air around it thins." — Expel · Expose · Contract · Enlarge

• Read the sentence first: the balloon gets bigger. You did not need a definition of expand to see that, and that is the whole point of this form.
• So the work is not "what does expand mean" but "which choice matches what the sentence just showed me" — and the sentence has already narrowed it to one idea.
• The trap: Contract. It is the opposite — growing smaller. Opposites are a common distractor, so a choice that reads as a straight reversal deserves a second look.
• Two of the choices are built from the word itself: Expel and Expose open with the same letters as expand and describe an entirely different movement. A shared prefix is not a shared meaning.
• Enlarge is the answer: to grow larger in size or volume, which is exactly what the sentence shows.

5. FRUGAL

Choose the word closest in meaning to FRUGAL as it is used in this sentence: "She was frugal as ever, patching the same work coat for the fourth winter running." — Generous · Wealthy · Thrifty · Wasteful

• Own gloss: careful with money. The coat is the word in action — repaired rather than replaced.
• The answer: Thrifty — the near-twin of frugal, and the choice the sentence is pointing at.
• The trap: Generous — about giving, not about spending carefully. Two different ideas that live in the same neighborhood.
• The other trap: Wasteful — the opposite. Direction alone settles this one: careful at one end, careless at the other.
• Intensity is the real subject here: frugal is careful with money, stingy is too careful, wasteful is not careful at all. Questions are often built on exactly those boundaries.

The confusables

These pairs are where this subtest takes its points. Each line is the boundary that decides the answer.

If a question offers two words from the same row, the question is almost certainly about the boundary, not the general meaning.

The vocabulary this subtest draws on

Not a dictionary — a working set. These are the words that show up on this subtest and in careful ordinary prose, grouped by the idea they belong to. Several of them appear in this topic's practice set, and that is deliberate: the free set is meant to be practice, not a quiz we grade you on. If a word below is unfamiliar, that is your signal about where to spend the time.

Amount and degree — ample (more than enough) · sufficient (exactly enough) · scarce (in short supply) · vast (extremely large) · diminish (to become smaller) · prolific (producing a great deal)

Work and effort — diligent (steady, careful effort) · meticulous (extremely careful about detail) · tenacious (holds on firmly) · resilient (recovers quickly) · arduous (demanding hard effort) · feeble (lacking strength)

Honesty and clarity — candid (open and frank) · mendacious (given to lying) · obscure (not well known; hard to follow) · vague (not clearly expressed) · transparent (you can see through it; also, open) · precise (exactly defined)

Feeling and willingness — cautious (careful to avoid risk) · reluctant (unwilling) · apprehensive (uneasy about what may happen) · hesitant (undecided) · gregarious (enjoys the company of others) · indifferent (not interested either way)

Obstacles and change — impede (to get in the way of) · withstand (to hold up against) · deteriorate (to become worse) · alleviate (to make less severe) · peril (serious danger) · compel (to force)

Character and conduct — frugal (careful with money) · prudent (sensible and cautious about the future) · conscientious (does the job properly) · affluent (wealthy) · endorse (to support publicly) · vociferous (loud and forceful in stating an opinion)

Words of change and effort — commence (to begin) · endeavor (an earnest attempt) · proficient (skilled through practice) · scrutinize (to examine closely) · conceal (to hide) · inevitable (certain to happen, unavoidable) · ancient (very old — easy to mix up with its opposite, modern)

Each of those seven was added after an audit found them in the practice set but missing from this list: the list is meant to be the vocabulary this bank actually uses, not a sample of it.

How to build this vocabulary in the time you have

• Learn words inside sentences, not as definitions. A definition learned in isolation is stored as a fact you can recite; a word met in a sentence is stored as a use, and the subtest asks you to recognize uses. Write your own sentence for every word you add.
• Five a day beats fifty on Sunday. Spaced, small doses are how vocabulary actually sticks; a single cramming session feels productive and evaporates.
• Review by covering, not re-reading. Hide the meaning and say it back. Re-reading feels like learning and is the weakest possible review — you are recognizing the page, not recalling the word.
• Sort words by the trap, not by the alphabet. Frugal / stingy / thrifty in one row is worth more than ten unrelated words, because that is the shape the questions take.
• Read prose a little above your comfort level with something to look words up. This subtest is drawn from ordinary careful writing, so ordinary careful writing is the study material.
• Then practice: the free Word Knowledge practice set — read every rationale, because the wrong-answer explanations are where the near misses are made explicit.

How to study for the ASVAB has the rest of the method, and what the pass adds.

Where to go next

• Next topic — Paragraph Comprehension
• The exam itself — how the ASVAB is scored, how many questions, and what makes the ASVAB hard.

Word Knowledge carries 15 of the 135 scored questions on the computer test — the published subtest table's count — and it is one of the four subtests the AFQT score is computed from.

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