Northerner vs Yank

Northerner and Yank both are nouns.

Word	Noun	Adjective	Verb	Adverb
Northerner	Yes	No	No	No
Yank	Yes	No	No	No

As nouns, Northerner and Yank are synonyms defined as:

Northerner and Yank: an American who lives in the North (especially during the American Civil War)

Other synonyms of Northerner include Yankee.

Northerner (noun)	Yank (noun)
an inhabitant of the North	an American (especially to non-Americans)
an American who lives in the North (especially during the American Civil War)	an American who lives in the North (especially during the American Civil War)