illiterate vs preliterate

illiterate is a noun but preliterate is not a noun.

Word	Noun	Adjective	Verb	Adverb
illiterate	Yes	Yes	No	No
preliterate	No	Yes	No	No

illiterate (noun)	preliterate (noun)
a person unable to read

illiterate (adjective)	preliterate (adjective)
not able to read or write	not yet having acquired the ability to read and write
lacking culture, especially in language and literature	used of a society that has not developed writing
uneducated in the fundamentals of a given art or branch of learning; lacking knowledge of a specific field