Pantotheria vs subclass Pantotheria

Pantotheria and subclass Pantotheria both are nouns.

Word	Noun	Adjective	Verb	Adverb
Pantotheria	Yes	No	No	No
subclass Pantotheria	Yes	No	No	No

As nouns, Pantotheria and subclass Pantotheria are synonyms defined as:

Pantotheria and subclass Pantotheria: generalized extinct mammals widespread during the Jurassic; commonly conceded to be ancestral to marsupial and placental mammals

Pantotheria (noun)	subclass Pantotheria (noun)
generalized extinct mammals widespread during the Jurassic; commonly conceded to be ancestral to marsupial and placental mammals	generalized extinct mammals widespread during the Jurassic; commonly conceded to be ancestral to marsupial and placental mammals