Bleak-ness, oerni; fferdod
Bleed-ing, gwaediad; gwaedlif
Blem-ish, anaf, bai: anafu, niweidio
Bless-ed, bendigedig, gwynfydedig
Bless-ing, bendith, llad
Blind-fold, mygydol: mygydu; dallu
Blind-ness, dallnieb, dellni
Blind-worm, madfall, dallneidr
Blis-ter, chwydalen: chwydalu
Bloat-ed, chwyddedig: balchaidd