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A supercharger supplies air to the cylinder at a pressure above ambient.
The term blower stems from the unit that blows air into a naturally aspirated two cycle diesel. Sounds contradictory, but it's true. This blower was taken from these engines (Detroit diesels) many years ago and adopted for high performance spark ignition engines (hence the terms 4-21, 6-21, 8-21. 6-21 = 6 cylinders, 21 cubic inches each.). When they were/are used on SI engines they do indeed operate as a supercharger, supplying air to the engine at above ambient pressures.
Sorry to be technical, but the truth is the truth.
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Bill