Wild Bill Hickock vs Wild Bill Hickok

Wild Bill Hickock and Wild Bill Hickok both are nouns.

Word	Noun	Adjective	Verb	Adverb
Wild Bill Hickock	Yes	No	No	No
Wild Bill Hickok	Yes	No	No	No

As nouns, Wild Bill Hickock and Wild Bill Hickok are synonyms defined as:

Wild Bill Hickock and Wild Bill Hickok: frontier marshal whose adventures have become legendary (1837-1876)

Other synonyms of Wild Bill Hickock include Hickock, James Butler Hickock.

Wild Bill Hickock (noun)	Wild Bill Hickok (noun)
frontier marshal whose adventures have become legendary (1837-1876)	frontier marshal whose adventures have become legendary (1837-1876)