What is a word that means the same as alliance?

accord, affiliation, affinity, betrothal, bond, coalition, coherence, collaboration, collusion, combination, communion, compact, concord, concurrence, confederacy, confederation, congruity, conjunction, connection, consanguinity, cooperation, engagement, entente, federation, fraternization, friendship, interrelation, kinship, league, marriage, matrimony, membership, mutuality, pact, participation, partnership, relation, support, tie, treaty, union