nightjar vs caprimulgid

nightjar and caprimulgid both are nouns.

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

As nouns, nightjar and caprimulgid are synonyms defined as:

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

Other synonyms of nightjar include goatsucker.

nightjar (noun)	caprimulgid (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