Cepheus vs Greek mythology

Cepheus and Greek mythology both are nouns.

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

Cepheus (noun)	Greek mythology (noun)
a faint constellation in the Northern Hemisphere near Cassiopeia and the pole star	the mythology of the ancient Greeks
(Greek mythology) king of Ethiopia and husband of Cassiopeia