northern harrier vs harrier

northern harrier and harrier both are nouns.

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

As nouns, harrier is a hypernym of northern harrier; that is, harrier is a word with a broader meaning than northern harrier:

northern harrier: common harrier of North America and Europe; nests in marshes and open land
harrier: hawks that hunt over meadows and marshes and prey on small terrestrial animals

northern harrier (noun)	harrier (noun)
common harrier of North America and Europe; nests in marshes and open land	hawks that hunt over meadows and marshes and prey on small terrestrial animals
	a hound that resembles a foxhound but is smaller; used to hunt rabbits
	a persistent attacker