Helen vs Greek mythology

Helen and Greek mythology both are nouns.

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

Helen (noun)	Greek mythology (noun)
(Greek mythology) the beautiful daughter of Zeus and Leda who was abducted by Paris; the Greek army sailed to Troy to get her back which resulted in the Trojan War	the mythology of the ancient Greeks