65 synonyms for argument such as outline, afters, apology, abstract, and gist. Argument is a noun, and its antonyms are agreement and harmony.
Afters, altercation, barney, bust-up, clash, contretemps, controversy, debate, difference of opinion, ding-dong, disagreement, discourse, discussion, disputation, dispute, dissension, dust-up, exchange of views, falling-out, feud, fight, quarrel, rammy, row, set-to, shouting/slanging match, spat, squabble, tiff, war of words, and wrangle.
Apology, argumentation, assertion, case, claim, contention, declaration, defence, demonstration, evidence, explanation, expostulation, grounds, justification, line of reasoning, logic, plea, polemic, rationalization, reasoning, reasons, and vindication.
Abstract, gist, outline, plot, precis, storyline, subject matter, summary, synopsis, theme, and topic.