Cog wheel and Gear wheel

Gear wheel and cog wheel are semantically related in gear topic. In some cases you can use "Gear wheel" instead a noun phrase "Cog wheel", when it comes to topics like cog.

Gear wheel noun - A toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion.

Cog wheel and gear wheel are semantically related in gear topic. You can use "Cog wheel" instead a noun phrase "Gear wheel", if it concerns topics such as cog.