There are several synonyms for the word "feuded" that can describe different levels or intensities of conflict. For instance, "quarreled" implies a more minor disagreement, while "argued" suggests a more heated exchange of words. "Fought" may imply physical violence or a prolonged, bitter dispute. Other options include "disputed," "squabbled," "clashed," "wrestled," and "wrangled." The specific synonym chosen can depend on the context of the conflict and the tone of the overall piece of writing.