Sub

n.	1.	A subordinate; a subaltern.
	2.	a shortened form of submarine, the boat.
	3.	a shortened form of submarine sandwich; also called hero, hero sandwich, and grinder.

Noun	1.	sub - a large sandwich made of a long crusty roll split lengthwise and filled with meats and cheese (and tomato and onion and lettuce and condiments); different names are used in different sections of the United States Synonyms: hero sandwich, hoagie, hoagy, Italian sandwich, poor boy, Cuban sandwich, grinder, submarine sandwich, zep, torpedo, wedge, submarine, bomber, hero
	2.	sub - a submersible warship usually armed with torpedoes Synonyms: pigboat, submarine, U-boat
Verb	1.	sub - be a substitute; "The young teacher had to substitute for the sick colleague"; "The skim milk substitutes for cream--we are on a strict diet" Synonyms: stand in, substitute, fill in

SUB - Substitute

U-boat, U-boot, Unterseeboot, act for, agent, alternate, alternative, analogy, backup, change, change places with, changeling, collateral, common, comparison, copy, counterfeit, crowd out, cut out, demeaning, dependent, deputy, disadvantaged, displace, double, double for, dummy, equal, equivalent, ersatz, exchange, fake, fill in for, fill-in, ghost, ghostwrite, ghostwriter, humble, imitation, in the shade, inferior, infra dig, junior, less, lesser, locum tenens, low, lower, lowly, makeshift, metaphor, metonymy, minor, modest, next best thing, ordinary, personnel, phony, pigboat, pinch hitter, pinch-hit, proxy, relief, relieve, replace, replacement, represent, representative, reserves, ringer, second rank, second string, secondary, servile, sign, spares, spell, spell off, stand in for, stand-in, subaltern, subject, submarine, submersible, subordinate, subrogate, subservient, substituent, substitute, substitute for, substitution, succedaneum, succeed, supersede, superseder, supplant, supplanter, surrogate, swap places with, symbol, synecdoche, third rank, third string, token, tributary, under, underprivileged, understudy, understudy for, utility player, vicar, vice-president, vice-regent, vulgar