writer vs Ernest Hemingway

writer and Ernest Hemingway both are nouns.

Word	Noun	Adjective	Verb	Adverb
writer	Yes	No	No	No
Ernest Hemingway	Yes	No	No	No

writer (noun)	Ernest Hemingway (noun)
writes (books or stories or articles or the like) professionally (for pay)	an American writer of fiction who won the Nobel prize for literature in 1954 (1899-1961)
a person who is able to write and has written something