dissension vs dissonance

dissension and dissonance both are nouns.

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

As nouns, dissension and dissonance are synonyms defined as:

dissension and dissonance: a conflict of people's opinions or actions or characters

Other synonyms of dissension include disagreement.

dissension (noun)	dissonance (noun)
disagreement among those expected to cooperate	disagreeable sounds
a conflict of people's opinions or actions or characters	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