Knox vs John Knox

Knox and John Knox both are nouns.

Word	Noun	Adjective	Verb	Adverb
Knox	Yes	No	No	No
John Knox	Yes	No	No	No

As nouns, Knox and John Knox are synonyms defined as:

Knox and John Knox: Scottish theologian who founded Presbyterianism in Scotland and wrote a history of the Reformation in Scotland (1514-1572)

Knox (noun)	John Knox (noun)
Scottish theologian who founded Presbyterianism in Scotland and wrote a history of the Reformation in Scotland (1514-1572)	Scottish theologian who founded Presbyterianism in Scotland and wrote a history of the Reformation in Scotland (1514-1572)