nicety vs significance

nicety and significance both are nouns.

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

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

Other hypernyms of nicety include import, meaning, signification.

nicety (noun)	significance (noun)
conformity with some esthetic standard of correctness or propriety	the quality of being significant
a subtle difference in meaning or opinion or attitude	a meaning that is not expressly stated but can be inferred
	the message that is intended or expressed or signified