rough-legged hawk vs Buteo lagopus

rough-legged hawk and Buteo lagopus both are nouns.

Word	Noun	Adjective	Verb	Adverb
rough-legged hawk	Yes	No	No	No
Buteo lagopus	Yes	No	No	No

As nouns, rough-legged hawk and Buteo lagopus are synonyms defined as:

rough-legged hawk and Buteo lagopus: large hawk of the Northern Hemisphere that feeds chiefly on small rodents and is beneficial to farmers

Other synonyms of rough-legged hawk include roughleg.

rough-legged hawk (noun)	Buteo lagopus (noun)
large hawk of the Northern Hemisphere that feeds chiefly on small rodents and is beneficial to farmers	large hawk of the Northern Hemisphere that feeds chiefly on small rodents and is beneficial to farmers