poet vs John Keats

poet and John Keats both are nouns.

Word	Noun	Adjective	Verb	Adverb
poet	Yes	No	No	No
John Keats	Yes	No	No	No

poet (noun)	John Keats (noun)
a writer of poems (the term is usually reserved for writers of good poetry)	Englishman and romantic poet (1795-1821)