I think a supercharger and a blower are the same thing in that they are both driven with a mechanical (i.e. not gas coupled) linkage to the engine. It may be belt or gear driven. We all know a turbocharger is a gas coupled device run by exhaust gasses. I think that automotive people tend to be familiar with the belt driven superchargers commonly called blowers, and aviation people (especially old folks like me who have some round motor experience)are more familiar with the gear driven versions we all call superchargers. Either way, they don't do you much good unless you are are beyond what would normally be full manifold pressure. Jack rabbit starts and driving 100 mph plus on the freeway are not smart ways to drive unless you are alone on the road. None of these devices will do you much good for normal driving (in a big Healey)in mho. They are common because it is a way to get more power from smaller, lighter engines, at the expense of higher temps and pressures (and fuel). Don't tell me that they improve fuel economy or anything like that because there is no free lunch in physics. What they do is allow trucks pulling trailers to get on to the freeway in a reasonable lenght of time and distance, and allow autmombiles with small displacement engines, to accelerate quickly and run at higher speed over a given distance. On the track they are great and if you have a fuel efficient car that lacks a safe margin of acceleration (not a big Healey trait) then they have their place. Oh, oh, I can see the worms getting out of the can...
Jon