in vs U.S.A.

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

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

in (noun)	U.S.A. (noun)
a unit of length equal to one twelfth of a foot	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

in (adverb)	U.S.A. (adverb)
to or toward the inside of