ignoramus vs illiterate

ignoramus and illiterate both are nouns.

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

As nouns, illiterate is a hyponym of ignoramus; that is, illiterate is a word with a more specific, narrower meaning than ignoramus:

Other hyponyms of ignoramus include aliterate, aliterate person, illiterate person, nonreader.

ignoramus (noun)	illiterate (noun)
an ignorant person	a person unable to read

ignoramus (adjective)	illiterate (adjective)
	not able to read or write
	lacking culture, especially in language and literature
	uneducated in the fundamentals of a given art or branch of learning; lacking knowledge of a specific field