Saurischia vs animal order

Saurischia and animal order both are nouns.

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

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

Saurischia: extinct terrestrial reptiles: theropods (carnivorous); sauropods (herbivorous)
animal order: the order of animals

Saurischia (noun)	animal order (noun)
extinct terrestrial reptiles: theropods (carnivorous); sauropods (herbivorous)	the order of animals