Johnny Cash vs Cash

Johnny Cash and Cash both are nouns.

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

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

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

Other synonyms of Johnny Cash include John Cash.

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