Nothosauria vs animal order

Nothosauria and animal order both are nouns.

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

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

Nothosauria (noun)	animal order (noun)
a suborder of Sauropterygia	the order of animals