poet vs John Millington Synge

poet and John Millington Synge both are nouns.

Word	Noun	Adjective	Verb	Adverb
poet	Yes	No	No	No
John Millington Synge	Yes	No	No	No

poet (noun)	John Millington Synge (noun)
a writer of poems (the term is usually reserved for writers of good poetry)	Irish poet and playwright whose plays are based on rural Irish life (1871-1909)