writer vs literate person

writer and literate person both are nouns.

Word	Noun	Adjective	Verb	Adverb
writer	Yes	No	No	No
literate person	Yes	No	No	No

As nouns, literate person is a hypernym of writer; that is, literate person is a word with a broader meaning than writer:

Other hypernyms of writer include literate.

writer (noun)	literate person (noun)
writes (books or stories or articles or the like) professionally (for pay)	a person who can read and write
a person who is able to write and has written something