Maes, an open field.

Mawr, great:—Vach, little.

Moel, fair; bald; a smooth mountain.

Morfa, a marsh.

Mynydd, a mountain.

Pant, a narrow hollow, or ravine.

Pen, a head, top, or end.

Plâs, a hall, or mansion.

Pont, a bridge.

Porth, a port.