whippoorwill vs goatsucker

whippoorwill and goatsucker both are nouns.

Word	Noun	Adjective	Verb	Adverb
whippoorwill	Yes	No	No	No
goatsucker	Yes	No	No	No

As nouns, goatsucker is a hypernym of whippoorwill; that is, goatsucker is a word with a broader meaning than whippoorwill:

whippoorwill: American nocturnal goatsucker with grey-and-white plumage
goatsucker: mainly crepuscular or nocturnal nonpasserine birds with mottled greyish-brown plumage and large eyes; feed on insects

Other hypernyms of whippoorwill include caprimulgid, nightjar.

whippoorwill (noun)	goatsucker (noun)
American nocturnal goatsucker with grey-and-white plumage	mainly crepuscular or nocturnal nonpasserine birds with mottled greyish-brown plumage and large eyes; feed on insects