Coexistence is the state of living together in HARMONY and PEACE. Synchronism (11 letters) is the coordination of events to operate together in HARMONY, CONCOMITANCE (12 letters) is the simultaneous occurrence of two or more things, PEACE (5 letters) is the absence of conflict and war, HARMONY (7 letters) is the state of being in AGREEMENT, ACCOMPANIMENT (13 letters) is the action of accompanying someone or something, AGREEMENT (9 letters) is a mutual understanding between two or more parties, and ACCORD (6 letters) is an AGREEMENT or settlement. All of these terms are related to coexistence, which is the ultimate goal of living together peacefully.