cyclostome vs jawless fish

cyclostome and jawless fish both are nouns.

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

As nouns, jawless fish is a hypernym of cyclostome; that is, jawless fish is a word with a broader meaning than cyclostome:

cyclostome: primitive aquatic vertebrate
jawless fish: eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms

Other hypernyms of cyclostome include agnathan, jawless vertebrate.

cyclostome (noun)	jawless fish (noun)
primitive aquatic vertebrate	eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms