discontinuity vs discontinuous

discontinuity is a noun but discontinuous is not a noun.

Word	Noun	Adjective	Verb	Adverb
discontinuity	Yes	No	No	No
discontinuous	No	Yes	No	No

discontinuity (noun)	discontinuous (noun)
lack of connection or continuity

discontinuity (adjective)	discontinuous (adjective)
	not continuing without interruption in time or space
	of a function or curve; possessing one or more discontinuities