U.S. vs reapportionment

U.S. and reapportionment both are nouns.

Word	Noun	Adjective	Verb	Adverb
U.S.	Yes	No	No	No
reapportionment	Yes	No	No	No

U.S. (noun)	reapportionment (noun)
the executive and legislative and judicial branches of the federal government of the United States	a new apportionment (especially a new apportionment of congressional seats in the United States on the basis of census results)
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