pomace fly vs fruit fly

pomace fly and fruit fly both are nouns.

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

As nouns, pomace fly and fruit fly are synonyms defined as:

pomace fly and fruit fly: any of numerous small insects whose larvae feed on fruits

pomace fly (noun)	fruit fly (noun)
any of numerous small insects whose larvae feed on fruits	any of numerous small insects whose larvae feed on fruits