Pleiades vs Greek mythology

Pleiades and Greek mythology both are nouns.

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

Pleiades (noun)	Greek mythology (noun)
a star cluster in the constellation Taurus	the mythology of the ancient Greeks
(Greek mythology) 7 daughters of Atlas and half-sisters of the Hyades; placed among the stars to save them from the pursuit of Orion