Gwiddan, n. a hag; a witch
Gwiddiant, n. a withering
Gwiddon, rotted particles; mites
Gwiddoni, v. to dry rot; to breed mites
Gwiddonog, a. having mites
Gwif, n. a lever, a crow-bar
Gwifrwym, n. a fulcrum
Gwig, n. a nook, a cove
Gwigfa, n. a cove, a retreat
Gwing, n. a wriggle, a wince