McCartney vs Paul McCartney

McCartney and Paul McCartney both are nouns.

Word	Noun	Adjective	Verb	Adverb
McCartney	Yes	No	No	No
Paul McCartney	Yes	No	No	No

As nouns, McCartney and Paul McCartney are synonyms defined as:

McCartney and Paul McCartney: English rock star and bass guitarist and songwriter who with John Lennon wrote most of the music for the Beatles (born in 1942)

Other synonyms of McCartney include Sir James Paul McCartney.

McCartney (noun)	Paul McCartney (noun)
English rock star and bass guitarist and songwriter who with John Lennon wrote most of the music for the Beatles (born in 1942)	English rock star and bass guitarist and songwriter who with John Lennon wrote most of the music for the Beatles (born in 1942)