A person or thing that compels; someone who forces or drives another person to do something.
From the verb compel plus the agent suffix -er (one who does the action). Compel comes from Latin compellere, meaning 'to drive together,' combining com- (together) and pellere (to push).
The word compeller vividly captures a power dynamic—it's not neutral like 'one who compels' but carries the weight of agency and force. Authors from the 17th and 18th centuries used compeller to describe everything from tyrants to conscience itself, personifying internal and external pressures.
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