The technically correct name for a "turbo" is turbosupercharger. It's just an exhaust gas driven supercharger, and if equipped it does not necessarily mean that the engine has a mechanically driven supercharger as well.
If an engine does have both it is commonly called a compound supercharged engine.
At least that is how I remember it.
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Personally speaking, the P-40 could contend on an equal footing with all the types of Messerschmitts, almost to the end of 1943.
~Nikolay Gerasimovitch Golodnikov
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