Proteus vs Greek mythology

Proteus and Greek mythology both are nouns.

Word	Noun	Adjective	Verb	Adverb
Proteus	Yes	No	No	No
Greek mythology	Yes	No	No	No

Proteus (noun)	Greek mythology (noun)
type genus of the Proteidae	the mythology of the ancient Greeks
(Greek mythology) a prophetic god who served Poseidon; was capable of changing his shape at will