What is the difference between a roots blower and a turbo blower?

Roots blower is low speed blower with rotation speed lower than 5000 rpm no matter AERZEN blower, Robuschi blower, Atlas Copco blower, GD blower, when turbo blower is high speed blower with rotation speed higher than 20000 rpm.
Here is the main difference of a roots blower and turbo blower.