Ecumenicism is the act of promoting unity and cooperation among different religions or denominations. Some synonyms or related terms for ecumenicism include interfaith dialogue, interdenominational cooperation, religious harmony, and religious tolerance. These concepts all share a focus on bridging divides and promoting understanding and collaboration across different religious traditions. Other related words might include inclusivity, diversity, pluralism, and mutual respect. In a world that is increasingly divided along religious lines, it is more important than ever to embrace ecumenical values and work towards greater tolerance, understanding, and cooperation across different faiths.