Nondenominational refers to something that is not affiliated with any particular religious denomination or organization. Some synonyms for nondenominational include interfaith, non-sectarian, ecumenical, and non-aligned. Interfaith refers to a movement that promotes cooperation and understanding between people of different faiths and beliefs. Non-sectarian refers to something that is not limited to a specific religious tradition. Ecumenical refers to a movement that promotes unity and cooperation among different Christian denominations. Non-aligned refers to something that is not associated with any particular religious, political, or ideological group. All these terms can be used interchangeably with nondenominational to describe something that is not affiliated with a particular religion or denomination.