black vulture vs carrion crow

black vulture and carrion crow both are nouns.

Word	Noun	Adjective	Verb	Adverb
black vulture	Yes	No	No	No
carrion crow	Yes	No	No	No

As nouns, black vulture and carrion crow are synonyms defined as:

black vulture and carrion crow: American vulture smaller than the turkey buzzard

Other synonyms of black vulture include Coragyps atratus.

black vulture (noun)	carrion crow (noun)
of southern Eurasia and northern Africa	American vulture smaller than the turkey buzzard
American vulture smaller than the turkey buzzard