Scru-pu-lous, ammheugar
Scru-ti-nize, adchwilio
Scru-ti-ny, olrhëawd, manwl chwiliad
Sea-son-ing, tymheriad; cywair
Se-clu-sion, cauad allan, ysgariad
Se-cre-cy, dirgelaidd, dirgelwch
Sec-u-lar, bydol, lleygol
Se-date-ness, arafwch, digyffroad
Sed-i-ment, gwaddod, gwaelod
Se-di-tion, terfysg, ymblaid