anaspid vs jawless fish

anaspid and jawless fish both are nouns.

Word	Noun	Adjective	Verb	Adverb
anaspid	Yes	No	No	No
jawless fish	Yes	No	No	No

As nouns, jawless fish is a hypernym of anaspid; that is, jawless fish 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
jawless fish: eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms

Other hypernyms of anaspid include agnathan, jawless vertebrate.

anaspid (noun)	jawless fish (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