Orcus vs Pluto

Orcus and Pluto both are nouns.

Word	Noun	Adjective	Verb	Adverb
Orcus	Yes	No	No	No
Pluto	Yes	No	No	No

As nouns, Orcus and Pluto are synonyms defined as:

Orcus and Pluto: (Roman mythology) god of the underworld; counterpart of Greek Hades

Other synonyms of Orcus include Dis, Dis Pater.

Orcus (noun)	Pluto (noun)
(Roman mythology) god of the underworld; counterpart of Greek Hades	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