emperor vs saturniid

emperor and saturniid both are nouns.

Word	Noun	Adjective	Verb	Adverb
emperor	Yes	No	No	No
saturniid	Yes	No	No	No

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

emperor: large moth of temperate forests of Eurasia having heavily scaled transparent wings
saturniid: large brightly colored and usually tropical moth; larvae spin silken cocoons

Other hypernyms of emperor include saturniid moth.

emperor (noun)	saturniid (noun)
large richly colored butterfly	large brightly colored and usually tropical moth; larvae spin silken cocoons
large moth of temperate forests of Eurasia having heavily scaled transparent wings
red table grape of California
the male ruler of an empire