poet vs William Schwenk Gilbert

poet and William Schwenk Gilbert both are nouns.

Word	Noun	Adjective	Verb	Adverb
poet	Yes	No	No	No
William Schwenk Gilbert	Yes	No	No	No

poet (noun)	William Schwenk Gilbert (noun)
a writer of poems (the term is usually reserved for writers of good poetry)	a librettist who was a collaborator with Sir Arthur Sullivan in a famous series of comic operettas (1836-1911)