lamprey vs lamper eel

lamprey and lamper eel both are nouns.

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

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

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

Other synonyms of lamprey include lamprey eel.

lamprey (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