intension vs significance

intension and significance both are nouns.

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

As nouns, significance is a hypernym of intension; that is, significance is a word with a broader meaning than intension:

intension: what you must know in order to determine the reference of an expression
significance: the message that is intended or expressed or signified

Other hypernyms of intension include import, meaning, signification.

intension (noun)	significance (noun)
what you must know in order to determine the reference of an expression	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