fungus gnat vs sciarid

fungus gnat and sciarid both are nouns.

Word	Noun	Adjective	Verb	Adverb
fungus gnat	Yes	No	No	No
sciarid	Yes	No	No	No

As nouns, fungus gnat and sciarid are synonyms defined as:

fungus gnat and sciarid: minute blackish gregarious flies destructive to mushrooms and seedlings

Other synonyms of fungus gnat include sciara.

fungus gnat (noun)	sciarid (noun)
mosquito-like insect whose larvae feed on fungi or decaying vegetation	minute blackish gregarious flies destructive to mushrooms and seedlings
minute blackish gregarious flies destructive to mushrooms and seedlings