WordNet sense 1 (a contentious speech act; a dispute where there is strong disagreement):

contention, controversy, disputation, tilt, arguing, contestation, disceptation

WordNet sense 2 (a discussion in which reasons are advanced for and against some proposition or proposal):

argumentation, debate

WordNet sense 3 (a fact or assertion offered as evidence that something is true):

statement

WordNet sense 4 (a summary of the subject or plot of a literary work or play or movie):

literary argument