order Stereospondyli vs superorder Labyrinthodontia

order Stereospondyli and superorder Labyrinthodontia both are nouns.

Word	Noun	Adjective	Verb	Adverb
order Stereospondyli	Yes	No	No	No
superorder Labyrinthodontia	Yes	No	No	No

order Stereospondyli (noun)	superorder Labyrinthodontia (noun)
formerly a suborder of Stegocephalia; amphibia having vertebrae whose component elements are fused into a single piece	extinct amphibians typically resembling heavy-bodied salamanders or crocodiles and having a solid flattened skull and conical teeth; Devonian through Triassic