pike-perch vs pike perch

pike-perch and pike perch both are nouns.

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

As nouns, pike-perch and pike perch are synonyms defined as:

pike-perch and pike perch: any of several pike-like fishes of the perch family

pike-perch (noun)	pike perch (noun)
any of several pike-like fishes of the perch family	any of several pike-like fishes of the perch family