Fferiad, n. congelation
Fferis, n. steel; a fire steel
Fferllyd, a. congealing; chilling
Ffern, n. the ankle bone
Fferu, v. to concrete; to freeze
Fferyll, n. chymist; metalurgist
Fferylliad, n. a chymist
Fferyllaeth, n. chymistry
Fferyllt, n. metalist; artisan
Fferylltaeth, n. mechanical art