Originally Posted by
SJX426
I know this is a controversy due to the common usage not being specific of the definition, cog vs sprocket. The definitions indicate a sprocket is a subset of cogs with the specific feature of the teeth engaging into a component like a chain and not another cog.
A cog is a tooth on a gearwheel called a cogwheel. A cogwheel engages with another cogwheel. A sprocket is a chainwheel, it engages with a chain. Every time someone refers to sprockets as cogs a kitten dies.