writer vs Philip Milton Roth

writer and Philip Milton Roth both are nouns.

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

writer (noun)	Philip Milton 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