significance vs significant

significance is a noun but significant is not a noun.

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

significance (noun)	significant (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

significance (adjective)	significant (adjective)
	important in effect or meaning
	too closely correlated to be attributed to chance and therefore indicating a systematic relation
	of considerable importance, size, or worth
	rich in significance or implication