Yank vs Northerner

Yank and Northerner both are nouns.

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

As nouns, Yank and Northerner are synonyms defined as:

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

Other synonyms of Yank include Yankee.

Yank (noun)	Northerner (noun)
an American (especially to non-Americans)	an inhabitant of the North
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)