Pluto vs Orcus

Pluto and Orcus both are nouns.

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

As nouns, Pluto and Orcus are synonyms defined as:

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

Other synonyms of Pluto include Dis, Dis Pater.

Pluto (noun)	Orcus (noun)
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
(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