argumento
/aɾɡuˈmento/ · B1 · noun · m
plot, story line
📖 Not just a fight: an argumento is the plot that argues the story forward
Latin argumentum meant the proof, and later the subject matter of a story. So in Spanish argumento covers both a line of reasoning and a film's or novel's plot. To say 'we had an argument', use discusión instead.