Federal vs northern

Federal is a noun but northern is not a noun.

Word	Noun	Adjective	Verb	Adverb
Federal	Yes	Yes	No	No
northern	No	Yes	No	No

Federal (noun)	northern (noun)
any federal law-enforcement officer
a member of the Union Army during the American Civil War

Federal (adjective)	northern (adjective)
being of or having to do with the northern United States and those loyal to the Union during the American Civil War	situated in regions of the north
	in or characteristic of a region of the United States north of (approximately) the Mason-Dixon line
	coming from the north; used especially of wind
	oriented toward the north