poet vs Omar Khayyam

poet and Omar Khayyam both are nouns.

Word	Noun	Adjective	Verb	Adverb
poet	Yes	No	No	No
Omar Khayyam	Yes	No	No	No

poet (noun)	Omar Khayyam (noun)
a writer of poems (the term is usually reserved for writers of good poetry)	Persian poet and mathematician and astronomer whose poetry was popularized by Edward Fitzgerald's translation (1050-1123)