Gwyllt, n. wild, savage, rapid. Dafaden, wyllt a cancer
Gwylltfil, n. a wild animal
Gwylltiad, n. a making wild
Gwylltineb, n. wildness; rage
Gwylltio, v. to make wild; to rage
Gwyllyn, n. culture; aration
Gwyllyniad, n. a culturing
Gwyllynio, v. to culture
Gwyllys, n. the will; desire
Gwyllysgar, a. willing; tractable