Rhaiadr, a cataract.

Rhiw, an ascent.

Ryhd, a ford.

Sarn, a causeway, a pavement.

Tal, the front or head, also tall.

Traeth, a sand or shore.

Tre or Tref, a home, a town.

Twr, a tower.

Ty, a house.

Y, the, of.