Penmaen, a promontory, a rocky head.
Penrhyn, a promontory, a cape.
Pentrev, a village, a hamlet.
Perth, a brake, a thornbush.
Pistyll, a spout of water.
Plâs, a mansion, a hall.
Plwyv, a parish.
Pont, a bridge.
Porth, a gate, a ferry.
Pwll, a pit, a pool.