U.S.A. vs partridge

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

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

U.S.A. (noun)	partridge (noun)
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	small Old World gallinaceous game birds
	a popular North American game bird; named for its call
	valued as a game bird in eastern United States and Canada
	heavy-bodied small-winged South American game bird resembling a gallinaceous bird but related to the ratite birds
	flesh of either quail or grouse