demoiselle vs percoid fish

demoiselle and percoid fish both are nouns.

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

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

Other hypernyms of demoiselle include percoid, percoidean.

demoiselle (noun)	percoid fish (noun)
small brilliantly colored tropical marine fishes of coral reefs	any of numerous spiny-finned fishes of the order Perciformes
a young unmarried woman