Ecumenic is a word that relates to religious unity or universalism. When searching for synonyms, we can consider words like ecumenical, catholic, interdenominational, all-encompassing, comprehensive and universal. Synonyms that reflect unity and inclusiveness include collective, cooperative, collaborative and harmonious. Broadening the search, we could additionally substitute with words that reflect a more secular version of ecumenicism, such as coexistence, interfaith, or multiculturalism. Words like reconciliatory and unifying also capture the essence of the concept of ecumenism, while words like holistic and global express the inclusive nature of the term as well. Ultimately, the choice of synonyms depends on the context and the intended emphasis of the message conveyed.