blackfly vs buffalo gnat

blackfly and buffalo gnat both are nouns.

Word	Noun	Adjective	Verb	Adverb
blackfly	Yes	No	No	No
buffalo gnat	Yes	No	No	No

As nouns, blackfly and buffalo gnat are synonyms defined as:

blackfly and buffalo gnat: small blackish stout-bodied biting fly having aquatic larvae; sucks the blood of birds as well as humans and other mammals

Other synonyms of blackfly include black fly.

blackfly (noun)	buffalo gnat (noun)
small blackish stout-bodied biting fly having aquatic larvae; sucks the blood of birds as well as humans and other mammals	small blackish stout-bodied biting fly having aquatic larvae; sucks the blood of birds as well as humans and other mammals
blackish aphid that infests e.g. beans and sugar beets