insignificance vs insignificant

insignificance is a noun but insignificant is not a noun.

Word	Noun	Adjective	Verb	Adverb
insignificance	Yes	No	No	No
insignificant	No	Yes	No	No

insignificance (noun)	insignificant (noun)
the quality of having little or no significance

insignificance (adjective)	insignificant (adjective)
	devoid of importance, meaning, or force
	signifying nothing
	of little importance or influence or power; of minor status
	small and unimpressive