Maen, a stone.

Maes, a plain, an open field.

Mawr, great, large.

Melin, a mill.

Moel, a smooth conical hill.

Mynydd, a mountain.

Nant, a ravine, a brook.

Newydd, new, fresh.

Pant, a hollow, a valley.

Pen, a head, a summit; also chief, or end.