So-no-rous, seinfawr, soniarus
Sooth-say-er, dewin, dewinwr
Soph-is-try, twyllresymiad
Sor-cer-er, swynwr
Sor-cer-y, swyngyfaredd
Sor-row-ful, trist, galarus
Sov-er-eign, penllywydd; penadur; goruchaf, goruchel
South-er-ly, deheuol
Spe-cif-ic, priodfeddyginiaeth; priodol, neillduol
Spe-ci-fy, penodi, gwahanodi