marsh hawk vs Circus cyaneus

marsh hawk and Circus cyaneus both are nouns.

Word	Noun	Adjective	Verb	Adverb
marsh hawk	Yes	No	No	No
Circus cyaneus	Yes	No	No	No

As nouns, marsh hawk and Circus cyaneus are synonyms defined as:

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

Other synonyms of marsh hawk include hen harrier, northern harrier.

marsh hawk (noun)	Circus cyaneus (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