Oedipus Rex vs Greek mythology

Oedipus Rex and Greek mythology both are nouns.

Word	Noun	Adjective	Verb	Adverb
Oedipus Rex	Yes	No	No	No
Greek mythology	Yes	No	No	No

Oedipus Rex (noun)	Greek mythology (noun)
(Greek mythology) a tragic king of Thebes who unknowingly killed his father Laius and married his mother Jocasta; the subject of the drama `Oedipus Rex' by Sophocles	the mythology of the ancient Greeks