writer vs Sir Thomas Malory

writer and Sir Thomas Malory both are nouns.

Word	Noun	Adjective	Verb	Adverb
writer	Yes	No	No	No
Sir Thomas Malory	Yes	No	No	No

writer (noun)	Sir Thomas Malory (noun)
writes (books or stories or articles or the like) professionally (for pay)	English writer who published a translation of romances about King Arthur taken from French and other sources (died in 1471)
a person who is able to write and has written something