continuous vs continuity

continuous is not a noun while continuity is a noun.

Word	Noun	Adjective	Verb	Adverb
continuous	No	Yes	No	No
continuity	Yes	No	No	No

continuous (noun)	continuity (noun)
	the property of a continuous and connected period of time
	a detailed script used in making a film in order to avoid discontinuities from shot to shot
	uninterrupted connection or union

continuous (adjective)	continuity (adjective)
continuing in time or space without interruption
of a function or curve; extending without break or irregularity