USA vs Yukon

USA and Yukon both are nouns.

Word	Noun	Adjective	Verb	Adverb
USA	Yes	No	No	No
Yukon	Yes	No	No	No

USA (noun)	Yukon (noun)
the army of the United States of America; the agency that organizes and trains soldiers for land warfare	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