sea lamprey vs lamprey

sea lamprey and lamprey both are nouns.

Word	Noun	Adjective	Verb	Adverb
sea lamprey	Yes	No	No	No
lamprey	Yes	No	No	No

As nouns, lamprey is a hypernym of sea lamprey; that is, lamprey is a word with a broader meaning than sea lamprey:

sea lamprey: large anadromous lamprey sometimes used as food; destructive of native fish fauna in the Great Lakes
lamprey: primitive eellike freshwater or anadromous cyclostome having round sucking mouth with a rasping tongue

Other hypernyms of sea lamprey include lamper eel, lamprey eel.

sea lamprey (noun)	lamprey (noun)
large anadromous lamprey sometimes used as food; destructive of native fish fauna in the Great Lakes	primitive eellike freshwater or anadromous cyclostome having round sucking mouth with a rasping tongue