cecropia moth vs saturniid moth

cecropia moth and saturniid moth both are nouns.

Word	Noun	Adjective	Verb	Adverb
cecropia moth	Yes	No	No	No
saturniid moth	Yes	No	No	No

As nouns, saturniid moth is a hypernym of cecropia moth; that is, saturniid moth is a word with a broader meaning than cecropia moth:

cecropia moth: North American silkworm moth; larvae feed on the leaves of forest trees
saturniid moth: large brightly colored and usually tropical moth; larvae spin silken cocoons

Other hypernyms of cecropia moth include saturniid.

cecropia moth (noun)	saturniid moth (noun)
North American silkworm moth; larvae feed on the leaves of forest trees	large brightly colored and usually tropical moth; larvae spin silken cocoons