marsh harrier vs harrier

marsh harrier and harrier both are nouns.

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

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

marsh harrier: Old World harrier frequenting marshy regions
harrier: hawks that hunt over meadows and marshes and prey on small terrestrial animals

marsh harrier (noun)	harrier (noun)
Old World harrier frequenting marshy regions	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