northern harrier vs hen harrier

northern harrier and hen harrier both are nouns.

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

As nouns, northern harrier and hen harrier are synonyms defined as:

northern harrier and hen harrier: common harrier of North America and Europe; nests in marshes and open land

Other synonyms of northern harrier include Circus cyaneus, marsh hawk.

northern harrier (noun)	hen harrier (noun)
common harrier of North America and Europe; nests in marshes and open land	common harrier of North America and Europe; nests in marshes and open land