ignoramus vs nonreader

ignoramus and nonreader both are nouns.

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

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

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

ignoramus (noun)	nonreader (noun)
an ignorant person	a student who is very slow in learning to read
	a person unable to read