terrible vs terribleness

terrible is not a noun while terribleness is a noun.

Word	Noun	Adjective	Verb	Adverb
terrible	No	Yes	No	No
terribleness	Yes	No	No	No

terrible (noun)	terribleness (noun)
	a quality of extreme unpleasantness

terrible (adjective)	terribleness (adjective)
causing fear or dread or terror
extreme in degree or extent or amount or impact
intensely or extremely bad or unpleasant in degree or quality
exceptionally bad or displeasing