agnathan vs aquatic vertebrate

agnathan and aquatic vertebrate both are nouns.

Word	Noun	Adjective	Verb	Adverb
agnathan	Yes	No	No	No
aquatic vertebrate	Yes	No	No	No

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

agnathan: eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms
aquatic vertebrate: animal living wholly or chiefly in or on water

agnathan (noun)	aquatic vertebrate (noun)
eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms	animal living wholly or chiefly in or on water