Ffosi, v. to trench, to ditch
Ffosiad, n. a trenching
Fosp, n. breach, a gap
Ffoswn, n. a gasher; a sword
Ffothell, n. a blister, a wheal
Ffothelliad, n. a blistering
Ffothellu, v. to blister
Ffraeth, a. prompt, fluent
Ffraethaidd, of fluent utterance
Ffraethder, n. fluency