USA vs buck

USA and buck both are nouns.

Word	Noun	Adjective	Verb	Adverb
USA	Yes	No	No	No
buck	Yes	No	Yes	No

USA (noun)	buck (noun)
the army of the United States of America; the agency that organizes and trains soldiers for land warfare	mature male of various mammals (especially deer or antelope)
North American republic containing 50 states - 48 conterminous states in North America plus Alaska in northwest North America and the Hawaiian Islands in the Pacific Ocean; achieved independence in 1776	a framework for holding wood that is being sawed
	a gymnastic horse without pommels and with one end elongated; used lengthwise for vaulting
	a piece of paper money worth one dollar

USA (verb)	buck (verb)
	jump vertically, with legs stiff and back arched
	move quickly and violently
	resist
	to strive with determination