Here is a list of verbs that start with PI.
pick, picked, picketed, picketing, picking
pickled, picks, picnicked, picture, pictured
pictures, picturing, piddling, piece, pierced
piercing, pile, piled, piles, pilfering
piling, pillage, pillaged, pillared, pilloried
pilot, piloting, pin, pinch, pinched
pinching, pinging, pinioned, pinned, pinning
pinpoint, pinpointing, pioneer, pioneered, pioneering
piped, piping, piss, pit, pitch
pitched, pitching, pitied, pity, pivoting
Hope you enjoy this page of verbs that start with pi and the rest of this verb list site as well.
Did I miss any verbs? Visitors can make this a more useful online resource by listing more verbs in the comments.