Cor-ner, cornel, congl, ongl
Cor-nice, taleithwrn, taladdurn
Cor-rect, cywir, difai: cywiro; ceryddu
Cor-rode, cyfysu, difa; rhydu
Cor-rupt, llygredig: llygru, halogi
Cor-sair, morwilliad, morleidr
Cos-tive, rhwym, bolrwym
Cost-ly, costus, treulfawr, drudfawr
Cos-tume, dullwisg; dullwedd
Cot-tage, bwthyn, bwth, caban