Nereus vs Greek mythology

Nereus and Greek mythology both are nouns.

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

Nereus (noun)	Greek mythology (noun)
(Greek mythology) a sea god son of Pontus and Gaea; lived in the depths of the sea with his wife Doris and their daughters the Nereids	the mythology of the ancient Greeks