Pons (pont-is), a bridge; pontiff, transpontine.
Popŭlus, the people; populace, popular.
Porto, I carry; export, deportation, report.
Possum, I am able; potens, able; possible, potency, potentate, impotent.
Poto, I drink; potion, poison, potable.
Prĕcor, I pray; precarious, imprecation.
Prehendo, I take; apprehend, comprehension, apprentice.
Premo (press-um), I press; compress, print.
Pretium, a price; precious, appreciate, prize.
Primus, first; prime, primitive, primrose.