The Oxford Thesaurus An A-Z Dictionary of Synonyms - argumentn.

1) debate, dispute, disagreement, quarrel, controversy, polemic, wrangle, squabble, tiff, spat, altercation; conflict, fight, fracas, affray, fray, Donnybrook, feud, Colloq row, falling-out, scrap, barney: The argument was about who had invented the wheel. The argument spilt out into the street. 2) point, position, (line of) reasoning, logic, plea, claim, pleading, assertion, contention, case; defence: His argument has merit. Arthur's argument falls apart when he brings in the phlogiston theory.