turkey buzzard vs cathartid

turkey buzzard and cathartid both are nouns.

Word	Noun	Adjective	Verb	Adverb
turkey buzzard	Yes	No	No	No
cathartid	Yes	No	No	No

As nouns, cathartid is a hypernym of turkey buzzard; that is, cathartid is a word with a broader meaning than turkey buzzard:

turkey buzzard: a New World vulture that is common in South America and Central America and the southern United States
cathartid: large birds of prey superficially similar to Old World vultures

Other hypernyms of turkey buzzard include New World vulture.

turkey buzzard (noun)	cathartid (noun)
a New World vulture that is common in South America and Central America and the southern United States	large birds of prey superficially similar to Old World vultures