mosquito hawk vs nighthawk

mosquito hawk and nighthawk both are nouns.

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

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

Other synonyms of mosquito hawk include bullbat.

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