Here are some words with their respective definition:
1. Gavel - A small mallet used by a presiding officer or an auctioneer to signal for attention or order or to mark the conclusion of a transaction; tribute or rent in ancient and medieval England; small mallet used by a presiding officer or a judge
2. Glut - To fill beyond capacity, especially with food; satiate
3. Paucity - Smallness of number; fewness; lack, scarcity; condition or fact of being deficient
4. Phlegmatic - Without emotion or interest; having or suggesting a calm, sluggish temperament; unemotional
5. Vigilance - Alert watchfulness; carefulness
6. Nadir - The lowest point
7. Summit - The highest point or part; the top; highest level or degree that can be attained; highest level, as of government officials; conference or meeting of high-level leaders, usually called to shape a program of action; top, crowning point
8. Indigent - Experiencing want or need; impoverished; needy or destitute person; poor; lacking or deficient
9. Augment - To make (something already developed or well under way) greater, as in size, extent, or quantity; make greater; improve; enlarge or make bigger
10. Proselyte - A new convert to a doctrine or religion

Here are some words that i've found in a study guide.

1. Superfluous - Being beyond what is required or sufficient; extra, unnecessary; serving no useful purpose; having no excuse for being; more than is needed, desired, or required
2. Spurn - To reject disdainfully or contemptuously; scorn; turn away; ignore
3. Hubris - Overbearing pride or presumption; arrogance
4. Feigned - Not real; pretended; not genuine; made-up; fictitious
5. Ravenous - Extremely hungry; voracious; rapacious; predatory; greedy for gratification; very hungry; desirous; greedy
6. Rapport - Relationship, especially one of mutual trust or emotional affinity; understanding between people; an easy friendly relationship
7. Anvil - An iron block or stand used by blacksmiths to hold metal objects; heavy block of iron or steel with a smooth, flat top on which metals are shaped by hammering
8. Pallid - Having an abnormally pale or wan complexion; lacking intensity of color or luminousness
9. Gong - A rimmed metal disk that produces a loud, sonorous tone when struck with a padded mallet; usually saucer-shaped bell that is struck with a mechanically operated hammer
10. Ostracize - To exclude from a group; to exclude from normal social or professional activities; to force to leave a country or place by official decree; exile, banish; to put into public disfavor

The following are words commonly appear in GRE verbal exam.

1. Deluge - An abundant, usually overwhelming flow or fall, as of a river or rain; barrage; great flood; heavy downpour; overrun with water; inundate
2. Doggerel - Crudely or irregularly fashioned verse, often of a humorous or burlesque nature; crude and comic verse
3. Sonnet - A 14-line verse form usually having one of several conventional rhyme schemes
4. Lax - Lacking in rigor, strictness, or firmness; not taut, firm, or compact; slack; not strict
5. Exacerbate - To increase the severity, violence, or bitterness of; aggravate; infuriate; make more sharp, severe, or virulent
6. Hellion - A mischievous, troublesome, or unruly person
7. Ramshackle - So poorly constructed or kept up that disintegration is likely; rickety
8. Pique - A state of vexation caused by a perceived slight or indignity; a feeling of wounded pride
9. Sanctimonious - Feigning piety or righteousness; of or practicing hypocrisy; self-righteous, hypocritical about one's own holiness
10. Treacle - Cloying speech or sentiment; a medicinal compound formerly used as an antidote for poison