Mynydd, a mountain.

Nant, a ravine, a brook.

Newydd, new, fresh.

Pant, a hollow or valley.

Pistyll, a spout, a cataract.

Plas, a hall or palace.

Plwyf, a parish.

Pont, a bridge.

Porth, a ferry, a port, a gateway.

Pwll, a pit or pool.