Lennon vs John Lennon

Lennon and John Lennon both are nouns.

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

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

Lennon and John Lennon: English rock star and guitarist and songwriter who with Paul McCartney wrote most of the music for the Beatles (1940-1980)

Lennon (noun)	John Lennon (noun)
English rock star and guitarist and songwriter who with Paul McCartney wrote most of the music for the Beatles (1940-1980)	English rock star and guitarist and songwriter who with Paul McCartney wrote most of the music for the Beatles (1940-1980)