writer vs Sir Rabindranath Tagore

writer and Sir Rabindranath Tagore both are nouns.

Word	Noun	Adjective	Verb	Adverb
writer	Yes	No	No	No
Sir Rabindranath Tagore	Yes	No	No	No

writer (noun)	Sir Rabindranath Tagore (noun)
writes (books or stories or articles or the like) professionally (for pay)	Indian writer and philosopher whose poetry (based on traditional Hindu themes) pioneered the use of colloquial Bengali (1861-1941)
a person who is able to write and has written something