writer vs G. B. Shaw

writer and G. B. Shaw both are nouns.

Word	Noun	Adjective	Verb	Adverb
writer	Yes	No	No	No
G. B. Shaw	Yes	No	No	No

writer (noun)	G. B. Shaw (noun)
writes (books or stories or articles or the like) professionally (for pay)	British playwright (born in Ireland); founder of the Fabian Society (1856-1950)
a person who is able to write and has written something