Synonyms to falling out

alienation, altercation, beef, bickering, breach, breach of friendship, break, cleavage, cleft, controversy, disaffection, disfavor, dispute, disruption, disunion, disunity, divergence, dividedness, division, estrangement, feud, hassle, open rupture, recall of ambassadors, rift, row, run-in, rupture, schism, separation, split