Erskine Caldwell vs writer

Erskine Caldwell and writer both are nouns.

Word	Noun	Adjective	Verb	Adverb
Erskine Caldwell	Yes	No	No	No
writer	Yes	No	No	No

Erskine Caldwell (noun)	writer (noun)
United States author remembered for novels about poverty and degeneration (1903-1987)	writes (books or stories or articles or the like) professionally (for pay)
	a person who is able to write and has written something