writer vs Sir Arthur Conan Doyle

writer and Sir Arthur Conan Doyle both are nouns.

Word	Noun	Adjective	Verb	Adverb
writer	Yes	No	No	No
Sir Arthur Conan Doyle	Yes	No	No	No

writer (noun)	Sir Arthur Conan Doyle (noun)
writes (books or stories or articles or the like) professionally (for pay)	British author who created Sherlock Holmes (1859-1930)
a person who is able to write and has written something