Cerberus vs Greek mythology

Cerberus and Greek mythology both are nouns.

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

Cerberus (noun)	Greek mythology (noun)
(Greek mythology) the three-headed dog guarding the entrance to Hades; son of Typhon	the mythology of the ancient Greeks