In uniform circular motion, speed is constant and velocity is variable because of changing direction.
When body returns to its point of projection, displacement is zero since initial and final position is same and distance is non-zero as particle moved up and returned down.
When a particle is projected upwards, its velocity is zero at the highest point but its acceleration is non-zero.
At an intermediate point of a body dropped from certain height, it gains velocity and has acceleration equal to acceleration due to gravity.