dissonance vs dissension

dissonance and dissension both are nouns.

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

As nouns, dissonance and dissension are synonyms defined as:

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

Other synonyms of dissonance include disagreement.

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