lamprey eel vs agnathan

lamprey eel and agnathan both are nouns.

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

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

lamprey eel: primitive eellike freshwater or anadromous cyclostome having round sucking mouth with a rasping tongue
agnathan: eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms

Other hypernyms of lamprey eel include jawless fish, jawless vertebrate.

lamprey eel (noun)	agnathan (noun)
primitive eellike freshwater or anadromous cyclostome having round sucking mouth with a rasping tongue	eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms