confrontation vs dissension

confrontation and dissension both are nouns.

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

As nouns, dissension is a hypernym of confrontation; that is, dissension is a word with a broader meaning than confrontation:

Other hypernyms of confrontation include discord.

confrontation (noun)	dissension (noun)
the act of hostile groups opposing each other	disagreement among those expected to cooperate
a focussed comparison; bringing together for a careful comparison	a conflict of people's opinions or actions or characters
a hostile disagreement face-to-face
a bold challenge
discord resulting from a clash of ideas or opinions