THESAURUS
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