1. One who tortures or harasses; a horse that moves with a racking pace.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• acker,
• ackere,
• ackeu,
• nacker,
• raker,
• ackel,
• rakar,
• rocker,
• eackes,
• yacker,
• kacker,
• mackel,
• namker,
• raceer,
• raccer,
• rackee,
• rackder,
• wracker,
• racquer,
• wrecker

• rocker,
• Raker,
• raiser,
• racer,
• Ricker,
• rockery,
• Rucker,
• rasher,
• razor,
• rasor,
• rager,
• recker.

The plural of the "racker" can be the "rackers".

The singular of the "racker" can be the "racker".