What is another word for "opposition"?

Roget's Thesaurus (1911) lists these synonyms for "opposition": action, adversary, adverse, against, although, and, antagonism, antagonist, antagonistic, antagonize, antarctic, antipodal, antipodes, antonym, arctic, assailant, asunder, beat, bete, block, brangler, brawler, check, clash, collision, compensate, compensation, competitor, conflict, conflicting, contraposition, contrariety, contrary, contravene, converse, counter, counteract, counteraction, counterpart, counterpoise.