Intercommunional is a unique word that refers to the interaction and communication between different communities. If you're looking for synonyms of this word, some common ones include intercommunity, interchurch, ecumenical, interfaith, and interdenominational. These words all relate to the interactions and collaborative efforts between distinct groups. For instance, interfaith communication involves people of different religions working together, while ecumenical communication refers to the interactions between various churches or denominations. These words embody the concept of reaching out beyond one's own community and fostering collaboration and harmony between different groups. Using these synonyms can help to improve communication and understanding between groups and promote greater unity in society.