overtone vs signification

overtone and signification both are nouns.

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

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

Other hypernyms of overtone include import, meaning, significance.

overtone (noun)	signification (noun)
a harmonic with a frequency that is a multiple of the fundamental frequency	the message that is intended or expressed or signified
(usually plural) an ulterior implicit meaning or quality