Roman mythology vs Pluto

Roman mythology and Pluto both are nouns.

Word	Noun	Adjective	Verb	Adverb
Roman mythology	Yes	No	No	No
Pluto	Yes	No	No	No

Roman mythology (noun)	Pluto (noun)
the mythology of the ancient Romans	a large asteroid that was once thought to be the farthest known planet from the sun; it has an elliptical orbit
	(Roman mythology) god of the underworld; counterpart of Greek Hades
	a cartoon character created by Walt Disney, a red-colored, medium-sized, short-haired dog with black ears