Rhaiadr, a cataract, a waterfall.
Rhiw, a slope.
Rhôs, a moor.
Rhudd, crimson, ruddy.
Rhyd, a ford. Rhydycroesau, the ford of the Crosses.
Sarn, a causeway.
Serth, steep, abrupt.
Swydd, an office, a county.
Tal, the head or front. Talcen, the forehead.