nightjar vs goatsucker

nightjar and goatsucker both are nouns.

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

As nouns, nightjar and goatsucker are synonyms defined as:

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

Other synonyms of nightjar include caprimulgid.

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