Bi-valve, deufasglog; dwygragenog
Black-bird, mwyalch, yr aderyn du
Black-guard, dyhiryn, drygadyn
Black-smith, gof, gof du
Blad-der, pledren, chwysigen
Blame-less, difai, diargyhoedd
Blan-ket, brycan, gwrthban
Blas-pheme, cablu, difenwi
Blast-ing, deifiad, malldod; seithugiad
Bleach-ing, caniad, gwyniad