harvestfish vs stromateid fish

harvestfish and stromateid fish both are nouns.

Word	Noun	Adjective	Verb	Adverb
harvestfish	Yes	No	No	No
stromateid fish	Yes	No	No	No

As nouns, stromateid fish is a hypernym of harvestfish; that is, stromateid fish is a word with a broader meaning than harvestfish:

harvestfish: butterfish up to a foot long of Atlantic waters from Chesapeake Bay to Argentina
stromateid fish: small marine fish with a short compressed body and feeble spines

Other hypernyms of harvestfish include butterfish, stromateid.

harvestfish (noun)	stromateid fish (noun)
butterfish up to a foot long of Atlantic waters from Chesapeake Bay to Argentina	small marine fish with a short compressed body and feeble spines