You are right. The swing arm is the part the tire bolts on to. It "swings" up and down to absorb the bumps in the road.
The subframe is the metal struture that supports the riders seat and passengers seat. It bolts to the frame on the R6. Some bikes have the subframe welded to the frame. Since the R6's is bolted on, if you wreck, the sub frame can be replaced. But the bikes whos are welded on are just S.O.L.
And there is no stupid questions, only stupid people....Just kidding. I am sure there are others with the same question, but too skeered to ask.
-DJ1298