U.S. vs Yukon

U.S. and Yukon both are nouns.

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

U.S. (noun)	Yukon (noun)
the executive and legislative and judicial branches of the federal government of the United States	a territory in northwestern Canada; site of the Klondike gold rush in the 1890s
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 North American river that flows westward from the Yukon Territory through central Alaska to the Bering Sea