writer vs John Roderigo Dos Passos

writer and John Roderigo Dos Passos both are nouns.

Word	Noun	Adjective	Verb	Adverb
writer	Yes	No	No	No
John Roderigo Dos Passos	Yes	No	No	No

writer (noun)	John Roderigo Dos Passos (noun)
writes (books or stories or articles or the like) professionally (for pay)	United States novelist remembered for his portrayal of life in the United States (1896-1970)
a person who is able to write and has written something