Devil vs Old Nick

Devil and Old Nick both are nouns.

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

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

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

Devil (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