USA vs military

USA and military both are nouns.

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

USA (noun)	military (noun)
the army of the United States of America; the agency that organizes and trains soldiers for land warfare	the military forces of a nation
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

USA (adjective)	military (adjective)
	associated with or performed by members of the armed services as contrasted with civilians
	characteristic of or associated with soldiers or the military
	of or relating to the study of the principles of warfare