emperor vs Saturnia pavonia

emperor and Saturnia pavonia both are nouns.

Word	Noun	Adjective	Verb	Adverb
emperor	Yes	No	No	No
Saturnia pavonia	Yes	No	No	No

As nouns, emperor and Saturnia pavonia are synonyms defined as:

emperor and Saturnia pavonia: large moth of temperate forests of Eurasia having heavily scaled transparent wings

Other synonyms of emperor include emperor moth.

emperor (noun)	Saturnia pavonia (noun)
large richly colored butterfly	large moth of temperate forests of Eurasia having heavily scaled transparent wings
large moth of temperate forests of Eurasia having heavily scaled transparent wings
red table grape of California
the male ruler of an empire