worm fish vs percoid fish

worm fish and percoid fish both are nouns.

Word	Noun	Adjective	Verb	Adverb
worm fish	Yes	No	No	No
percoid fish	Yes	No	No	No

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

worm fish: poorly known family of small tropical shallow-water fishes related to gobies
percoid fish: any of numerous spiny-finned fishes of the order Perciformes

Other hypernyms of worm fish include percoid, percoidean.

worm fish (noun)	percoid fish (noun)
poorly known family of small tropical shallow-water fishes related to gobies	any of numerous spiny-finned fishes of the order Perciformes