Cash vs John Cash

Cash and John Cash both are nouns.

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

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

Cash and John Cash: United States country music singer and songwriter (1932-2003)

Other synonyms of Cash include Johnny Cash.

Cash (noun)	John Cash (noun)
United States country music singer and songwriter (1932-2003)	United States country music singer and songwriter (1932-2003)