Frol-ic-some, gorhoenus, chwareugar
Front-is-piece, talwyneb; gwyneblun
Fro-ward-ness, afrywiogrwydd
Fruc-ti-fy, cnydio; ffrwythiannu
Fu-gi-tive, ffoadur; ffoadurus
Ful-mi-nate, taranu; bygwth
Fun-da-ment, yr eisteddfa, rhefr
Fu-ner-al, angladd; angladdol
Fu-ri-ous, ffyrnig, gorphwyllog
Fur-nish-ing, diwalliad; dodrefniad