gall gnat vs gall midge

gall gnat and gall midge both are nouns.

Word	Noun	Adjective	Verb	Adverb
gall gnat	Yes	No	No	No
gall midge	Yes	No	No	No

As nouns, gall gnat and gall midge are synonyms defined as:

gall gnat and gall midge: fragile mosquito-like flies that produce galls on plants

Other synonyms of gall gnat include gallfly.

gall gnat (noun)	gall midge (noun)
fragile mosquito-like flies that produce galls on plants	fragile mosquito-like flies that produce galls on plants