Ephemerida vs order Ephemerida

Ephemerida and order Ephemerida both are nouns.

Word	Noun	Adjective	Verb	Adverb
Ephemerida	Yes	No	No	No
order Ephemerida	Yes	No	No	No

As nouns, Ephemerida and order Ephemerida are synonyms defined as:

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

Other synonyms of Ephemerida include Ephemeroptera, order Ephemeroptera.

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