English morphological rules detail how words relate to other words. Thus, my best assumption would be because BOLDEST is an adjective whereas BOLDLY is an adverb.
Answer:
Zoom. Without a doubt, zooming is the most used (and therefore, most overused).
Pan. Panning is when you move your camera horizontally; either left to right or right to left, while its base is fixated on a certain point.
And tilt.
