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