Calderon de la Barca vs poet

Calderon de la Barca and poet both are nouns.

Word	Noun	Adjective	Verb	Adverb
Calderon de la Barca	Yes	No	No	No
poet	Yes	No	No	No

Calderon de la Barca (noun)	poet (noun)
Spanish poet and dramatist considered one of the great Spanish writers (1600-1681)	a writer of poems (the term is usually reserved for writers of good poetry)