ignorant vs ignorantness

ignorant is not a noun while ignorantness is a noun.

Word	Noun	Adjective	Verb	Adverb
ignorant	No	Yes	No	No
ignorantness	Yes	No	No	No

ignorant (noun)	ignorantness (noun)
	ignorance (especially of orthodox beliefs)

ignorant (adjective)	ignorantness (adjective)
unaware because of a lack of relevant information or knowledge
uneducated in the fundamentals of a given art or branch of learning; lacking knowledge of a specific field
uneducated in general; lacking knowledge or sophistication