anaspid vs agnathan

anaspid and agnathan both are nouns.

Word	Noun	Adjective	Verb	Adverb
anaspid	Yes	No	No	No
agnathan	Yes	No	No	No

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

anaspid: extinct small freshwater jawless fish usually having a heterocercal tail and an armored head; of the Silurian and Devonian
agnathan: eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms

Other hypernyms of anaspid include jawless fish, jawless vertebrate.

anaspid (noun)	agnathan (noun)
extinct small freshwater jawless fish usually having a heterocercal tail and an armored head; of the Silurian and Devonian	eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms