discordance vs dissonance

discordance and dissonance both are nouns.

Word	Noun	Adjective	Verb	Adverb
discordance	Yes	No	No	No
dissonance	Yes	No	No	No

As nouns, dissonance is a hypernym of discordance; that is, dissonance is a word with a broader meaning than discordance:

discordance (noun)	dissonance (noun)
strife resulting from a lack of agreement	disagreeable sounds
a harsh mixture of sounds	the auditory experience of sound that lacks musical quality; sound that is a disagreeable auditory experience
	a conflict of people's opinions or actions or characters