deductible vs nondeductible

deductible is a noun but nondeductible is not a noun.

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

deductible (noun)	nondeductible (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)

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