drosophila vs pomace fly

drosophila and pomace fly both are nouns.

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

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

drosophila: small fruit fly used by Thomas Hunt Morgan in studying basic mechanisms of inheritance
pomace fly: any of numerous small insects whose larvae feed on fruits

Other hypernyms of drosophila include fruit fly.

drosophila (noun)	pomace fly (noun)
small fruit fly used by Thomas Hunt Morgan in studying basic mechanisms of inheritance	any of numerous small insects whose larvae feed on fruits