writer vs Philip Roth

writer and Philip Roth both are nouns.

Word	Noun	Adjective	Verb	Adverb
writer	Yes	No	No	No
Philip Roth	Yes	No	No	No

writer (noun)	Philip Roth (noun)
writes (books or stories or articles or the like) professionally (for pay)	United States writer whose novels portray middle-class Jewish life (born in 1933)
a person who is able to write and has written something