The word "anti's cousin" can have a number of synonyms depending on the context. One common synonym is "opponent," which refers to someone who is against a particular idea or action. Another synonym is "adversary," which implies a more intense level of opposition or conflict. Other possible synonyms include "foe," "nemesis," "rival," or "antagonist." Each of these words captures a slightly different nuance of the concept of opposition, but they can all be used interchangeably with "anti's cousin" in the right context. Whether you are discussing politics, sports, or personal relationships, there is likely a perfect synonym for the situation at hand.