U.S. vs Athapascan

U.S. and Athapascan both are nouns.

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

U.S. (noun)	Athapascan (noun)
the executive and legislative and judicial branches of the federal government of the United States	a group of Amerindian languages (the name coined by an American anthropologist, Edward Sapir)
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 member of any of the North American Indian groups speaking an Athapaskan language and living in the subarctic regions of western Canada and central Alaska