clingfish vs percoid fish

clingfish and percoid fish both are nouns.

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

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

clingfish: very small (to 3 inches) flattened marine fish with a sucking disc on the abdomen for clinging to rocks etc.
percoid fish: any of numerous spiny-finned fishes of the order Perciformes

Other hypernyms of clingfish include percoid, percoidean.

clingfish (noun)	percoid fish (noun)
very small (to 3 inches) flattened marine fish with a sucking disc on the abdomen for clinging to rocks etc.	any of numerous spiny-finned fishes of the order Perciformes