writer vs Henry David Thoreau

writer and Henry David Thoreau both are nouns.

Word	Noun	Adjective	Verb	Adverb
writer	Yes	No	No	No
Henry David Thoreau	Yes	No	No	No

writer (noun)	Henry David Thoreau (noun)
writes (books or stories or articles or the like) professionally (for pay)	United States writer and social critic (1817-1862)
a person who is able to write and has written something