Gwychydd, n. a hero, worthy
Gwyd, n. passion, vice
Gwydio, v. to become vicious
Gwydiol, a. vicious, wicked
Gwydn, a. tough, tenacious, viscid
Gwydnau, v. to become tough
Gwydnedd, n. toughness, tenacity
Gwydr, n. glass; green
Gwydraid, n. a glass-ful
Gwydraidd, a. vitreous, glassy