Ephemeroptera vs animal order

Ephemeroptera and animal order both are nouns.

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

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

Ephemeroptera: the order of mayflies or shadflies (Ephemeroptera, Ephemerida)
animal order: the order of animals

Ephemeroptera (noun)	animal order (noun)
the order of mayflies or shadflies (Ephemeroptera, Ephemerida)	the order of animals