Gwrthyni, n. deformity, ugliness
Gwrthwad, n. a counter denial
Gwrthwaith, n. a retroaction
Gwrthwal, n. a contramure
Gwrthwon, n. contravention
Gwrthwe, n. a lining
Gwrthwead, a counter weaving
Gwrthwediad, n. contradiction
Gwrthwedd, n. a contrast
Gwrthwenwyn, n. a counterpoison; an antidote