demoiselle vs percoid

demoiselle and percoid both are nouns.

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

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

Other hypernyms of demoiselle include percoid fish, percoidean.

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