nighthawk vs mosquito hawk

nighthawk and mosquito hawk both are nouns.

Word	Noun	Adjective	Verb	Adverb
nighthawk	Yes	No	No	No
mosquito hawk	Yes	No	No	No

As nouns, nighthawk and mosquito hawk are synonyms defined as:

Other synonyms of nighthawk include bullbat.

nighthawk (noun)	mosquito hawk (noun)
mainly nocturnal North American goatsucker	slender-bodied non-stinging insect having iridescent wings that are outspread at rest; adults and nymphs feed on mosquitoes etc.
a person who likes to be active late at night	mainly nocturnal North American goatsucker