U.S. vs dollar bill

U.S. and dollar bill both are nouns.

Word	Noun	Adjective	Verb	Adverb
U.S.	Yes	No	No	No
dollar bill	Yes	No	No	No

U.S. (noun)	dollar bill (noun)
the executive and legislative and judicial branches of the federal government of the United States	a piece of paper money worth one dollar
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