medfly vs pomace fly

medfly and pomace fly both are nouns.

Word	Noun	Adjective	Verb	Adverb
medfly	Yes	No	No	No
pomace fly	Yes	No	No	No

As nouns, pomace fly is a hypernym of medfly; that is, pomace fly is a word with a broader meaning than medfly:

medfly: small black-and-white fly that damages citrus and other fruits by implanting eggs that hatch inside the fruit
pomace fly: any of numerous small insects whose larvae feed on fruits

Other hypernyms of medfly include fruit fly.

medfly (noun)	pomace fly (noun)
small black-and-white fly that damages citrus and other fruits by implanting eggs that hatch inside the fruit	any of numerous small insects whose larvae feed on fruits