The term "Instituter" refers to a person or organization that establishes an institution or initiates a new project. The antonyms of Instituter are the terms that convey opposite meanings or have a contrary nature to this term. The antonyms for Instituter are - Dismantler, Dissolver, Destroyer, Abolisher, Eliminator, and Ender. These words describe the opposite action to creating something new or establishing an institution, i.e., the act of breaking or ending something. Dismantler refers to the act of taking apart something, while Dissolver means to dissolve or disintegrate. Destroyer, Abolisher, and Eliminator refer to the act of terminating or removing something fully, while Ender depicts the act of concluding something.