Common words:
* Playing
* Painting
* Planning
* Passing
* Packing
* Printing
* Plunging
* Pouting
* Preaching
* Pleading
* Pouring
* Praising
* Probing
* Prolonging
* Promising
* Pouncing
Less common words:
* Paling
* Palling
* Panting
* Parrying
* Pasting
* Pattering
* Pausing
* Peeling
* Peaking
* Perishing
* Placing
* Plotting
* Plucking
* Poaching
* Pointing
* Polling
* Pondering
* Posing
* Practicing
* Prevailing
* Priming
* Proceeding
* Profiling
* Projecting
* Propelling
* Purchasing
* Pursuing
* Putting
Note: This list is not exhaustive, and there may be other words that fit this criteria.