pike perch vs dory

pike perch and dory both are nouns.

Word	Noun	Adjective	Verb	Adverb
pike perch	Yes	No	No	No
dory	Yes	No	No	No

As nouns, dory is a hyponym of pike perch; that is, dory is a word with a more specific, narrower meaning than pike perch:

Other hyponyms of pike perch include jack salmon, Stizostedion vitreum, walleye, walleyed pike.

pike perch (noun)	dory (noun)
any of several pike-like fishes of the perch family	marine fishes widely distributed in mid-waters and deep slope waters
	pike-like freshwater perches
	a small boat of shallow draft with cross thwarts for seats and rowlocks for oars with which it is propelled