The antonyms for the word "rightwinger" can be "leftist," "liberal," "progressive," "socialist," "radical," "communist," "anarchist," "left-leaning," or "far-left." These terms describe political ideologies that prioritize government intervention in economic and social issues, promoting equitable distribution of wealth and resources, individual freedoms and rights, and international cooperation. Unlike rightwingers who emphasize traditional and conservative values, national sovereignty, and free-market capitalism, leftists believe in redefining social norms, reducing economic inequalities, and protecting the environment. The antonyms for the word "rightwinger" represent a diverse spectrum of values and beliefs that contrast and challenge conservative and authoritarian ideologies.