lamprey eel vs lamper eel

lamprey eel and lamper eel both are nouns.

Word	Noun	Adjective	Verb	Adverb
lamprey eel	Yes	No	No	No
lamper eel	Yes	No	No	No

As nouns, lamprey eel and lamper eel are synonyms defined as:

lamprey eel and lamper eel: primitive eellike freshwater or anadromous cyclostome having round sucking mouth with a rasping tongue

Other synonyms of lamprey eel include lamprey.

lamprey eel (noun)	lamper eel (noun)
primitive eellike freshwater or anadromous cyclostome having round sucking mouth with a rasping tongue	primitive eellike freshwater or anadromous cyclostome having round sucking mouth with a rasping tongue