stargazer vs percoid fish

stargazer and percoid fish both are nouns.

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

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

stargazer: heavy-bodied marine bottom-lurkers with eyes on flattened top of the head
percoid fish: any of numerous spiny-finned fishes of the order Perciformes

Other hypernyms of stargazer include percoid, percoidean.

stargazer (noun)	percoid fish (noun)
heavy-bodied marine bottom-lurkers with eyes on flattened top of the head	any of numerous spiny-finned fishes of the order Perciformes
a physicist who studies astronomy
someone indifferent to the busy world