hen harrier vs Circus cyaneus

hen harrier and Circus cyaneus both are nouns.

Word	Noun	Adjective	Verb	Adverb
hen harrier	Yes	No	No	No
Circus cyaneus	Yes	No	No	No

As nouns, hen harrier and Circus cyaneus are synonyms defined as:

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

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

hen harrier (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