a roots blower takes large volumes of air around and shoves it into an open area in the manifold. a twin screw blower meshes together and provides a boost at a higher rpm. Roots blowers are an older technology but are very reliable at providing power at all rpm levels.
May not be clear definitions but it is hard to describe in words.
The supercharger on the new ZR1 is a Roots/Twin Screw Hybrid
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