buck vs U.S.A.

buck and U.S.A. both are nouns.

Word	Noun	Adjective	Verb	Adverb
buck	Yes	No	Yes	No
U.S.A.	Yes	No	No	No

buck (noun)	U.S.A. (noun)
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

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