USA vs slave market

USA and slave market both are nouns.

Word	Noun	Adjective	Verb	Adverb
USA	Yes	No	No	No
slave market	Yes	No	No	No

USA (noun)	slave market (noun)
the army of the United States of America; the agency that organizes and trains soldiers for land warfare	a marketplace where slaves were auctioned off (especially in the southern United States before 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