Answer
The angular speed is a measure of how fast the pendulum is moving at a certain time t, while the angular frequency is a measure of how fast the pendulum completes its cycles, being the number of cycles per second.
The angular speed is constantly changing over the course of a period, starting at zero at the top and accelerating to the bottom to its maximum speed before slowing once more. The angular frequency, on the other hand, is constant so long as there is no damping.
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