The phrase "cog wheel" is often used to describe the teeth or cogs on a mechanical device that allow it to move or operate. However, there are several other words that can be used instead of "cog wheel" depending on the context and the type of equipment in question. Some synonyms for "cog wheel" include gear, sprocket, pulley, sheave, wheel-and-axle, and belt drive. Each of these terms refers to a specific component of a machine that plays a similar role to that of the cog wheel. By using these synonyms appropriately, writers and engineers can communicate more effectively and accurately about mechanical devices and their operation.