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