Satan vs Old Nick

Satan and Old Nick both are nouns.

Word	Noun	Adjective	Verb	Adverb
Satan	Yes	No	No	No
Old Nick	Yes	No	No	No

As nouns, Satan and Old Nick are synonyms defined as:

Satan and Old Nick: (Judeo-Christian and Islamic religions) chief spirit of evil and adversary of God; tempter of mankind; master of Hell

Other synonyms of Satan include Beelzebub, Devil, Lucifer, Prince of Darkness, the Tempter.

Satan (noun)	Old Nick (noun)
(Judeo-Christian and Islamic religions) chief spirit of evil and adversary of God; tempter of mankind; master of Hell	(Judeo-Christian and Islamic religions) chief spirit of evil and adversary of God; tempter of mankind; master of Hell