insignificant vs significance

insignificant is not a noun while significance is a noun.

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

insignificant (noun)	significance (noun)
	the quality of being significant
	a meaning that is not expressly stated but can be inferred
	the message that is intended or expressed or signified

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