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No, a grinder/sander scratches, but faster.
A chainsaw gouges and tears. >

What is a scratch if not just a tiny tear or gouge? >

A scratch is just friction. A gouge is an incision brought in by a focal point. >

"just friction" LoL
It's not a focal point, it's just the leading edge of a sand grain frictioning into the material, totes different!
/s >

I hate to be that guy, but "scratch" implies something completely different than what a chainsaw does. A properly sharpened tooth will have a face similar in shape to a cresting wave. That tooth will dig and scoop the wood, not cutting the wood but taking chunks out at a time. >

Each cutting link on a chainsaw is like a tiny chisel. They cut deep into the wood underneath the surface. It might be more accurate to say a handsaw scratches.