Herbert Marshall McLuhan vs writer

Herbert Marshall McLuhan and writer both are nouns.

Word	Noun	Adjective	Verb	Adverb
Herbert Marshall McLuhan	Yes	No	No	No
writer	Yes	No	No	No

Herbert Marshall McLuhan (noun)	writer (noun)
Canadian writer noted for his analyses of the mass media (1911-1980)	writes (books or stories or articles or the like) professionally (for pay)
	a person who is able to write and has written something