subtlety vs signification

subtlety and signification both are nouns.

Word	Noun	Adjective	Verb	Adverb
subtlety	Yes	No	No	No
signification	Yes	No	No	No

As nouns, signification is a hypernym of subtlety; that is, signification is a word with a broader meaning than subtlety:

Other hypernyms of subtlety include import, meaning, significance.

subtlety (noun)	signification (noun)
the quality of being difficult to detect or analyze	the message that is intended or expressed or signified
a subtle difference in meaning or opinion or attitude