Stereospondyli vs animal order

Stereospondyli and animal order both are nouns.

Word	Noun	Adjective	Verb	Adverb
Stereospondyli	Yes	No	No	No
animal order	Yes	No	No	No

As nouns, animal order is a hypernym of Stereospondyli; that is, animal order is a word with a broader meaning than Stereospondyli:

Stereospondyli: formerly a suborder of Stegocephalia; amphibia having vertebrae whose component elements are fused into a single piece
animal order: the order of animals

Stereospondyli (noun)	animal order (noun)
formerly a suborder of Stegocephalia; amphibia having vertebrae whose component elements are fused into a single piece	the order of animals