Six-fold, chwethro, chwephlyg
Six-pence, chwecheiniog
Six-ty, triugain
Skil-ful, medrus, hyfedr, celfydd
Skin-ner, crwynwr; blingwr
Skip-ping, llamsachiad, neidiad
Skir-mish, ysgarmes: ymryson
Sky-lark, ehedydd
Sky-light, nenwawl
Slan-der, athrod, absen: athrodi, absenu