nondeductible vs deductible

nondeductible is not a noun while deductible is a noun.

Word	Noun	Adjective	Verb	Adverb
nondeductible	No	Yes	No	No
deductible	Yes	Yes	No	No

nondeductible (noun)	deductible (noun)
	a clause in an insurance policy that relieves the insurer of responsibility to pay the initial loss up to a stated amount
	(taxes) an amount that can be deducted (especially for the purposes of calculating income tax)

nondeductible (adjective)	deductible (adjective)
not allowable as a deduction	acceptable as a deduction (especially as a tax deduction)