marsh hawk vs northern harrier

marsh hawk and northern harrier both are nouns.

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

As nouns, marsh hawk and northern harrier are synonyms defined as:

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

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

marsh hawk (noun)	northern 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