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@TM
cog is usually fixed gear, sprocket would mount onto a cassette freewheel (like a converted road wheel) and a freewheel would screw on like a cog yet allow you to coast.
To be clear, are you after a wheel you can run as fixed, fixed & freewheel or just freewheel. Also is the "cog" in fact a freewheel or a sprocket that would work as a singlespeed, or indeed a fixed cog for use as a fixed gear?