Iapetus vs Greek mythology

Iapetus and Greek mythology both are nouns.

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

Iapetus (noun)	Greek mythology (noun)
(Greek mythology) the Titan who was father of Atlas and Epimetheus and Prometheus in ancient mythology	the mythology of the ancient Greeks