Rhuthrol, a. rushing; assailing
Rhuthriad, n. a rushing on
Rhuwch, n. exterior coat; a rug
Rhuwchen, n. a rough coat; a rug
Rhwb, n. a rub, a chafe
Rhwbiad, n. rubbing; friction
Rhwbio, v. to rub, to chafe
Rhwch, n. what is rough; a grunt
Rhwchiad, n. a grunting
Rhwchial, n. a shrill grunting