gallfly vs insect

gallfly and insect both are nouns.

Word	Noun	Adjective	Verb	Adverb
gallfly	Yes	No	No	No
insect	Yes	No	No	No

As nouns, insect is a hypernym of gallfly; that is, insect is a word with a broader meaning than gallfly:

gallfly: any of various insects that deposit their eggs in plants causing galls in which the larvae feed
insect: small air-breathing arthropod

gallfly (noun)	insect (noun)
any of various insects that deposit their eggs in plants causing galls in which the larvae feed	small air-breathing arthropod
small solitary wasp that produces galls on oaks and other plants	a person who has a nasty or unethical character undeserving of respect
fragile mosquito-like flies that produce galls on plants