MS vs USA

MS and USA both are nouns.

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

MS (noun)	USA (noun)
a master's degree in science	the army of the United States of America; the agency that organizes and trains soldiers for land warfare
a state in the Deep South on the gulf of Mexico; one of the Confederate States during the American Civil War	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 chronic progressive nervous disorder involving loss of myelin sheath around certain nerve fibers