mullet vs percoid fish

mullet and percoid fish both are nouns.

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

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

mullet: bottom dwelling marine warm water fishes with two barbels on the chin
percoid fish: any of numerous spiny-finned fishes of the order Perciformes

Other hypernyms of mullet include bottom-dweller, bottom-feeder, percoid, percoidean.

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

mullet: freshwater or coastal food fishes a spindle-shaped body; found worldwide
percoid fish: any of numerous spiny-finned fishes of the order Perciformes

Other hypernyms of mullet include percoid, percoidean.

mullet (noun)	percoid fish (noun)
bottom dwelling marine warm water fishes with two barbels on the chin	any of numerous spiny-finned fishes of the order Perciformes
freshwater or coastal food fishes a spindle-shaped body; found worldwide
highly valued lean flesh of marine or freshwater mullet