Sleep, cwsg: cysgu

Sleet, odwlaw

Slept, cysgedig

Slice, tafell: tafellu

Slide, llithrfa: llithro

Slime, dyglist

Sling, tafl: taflu

Sloes, eirin perthi

Sloop, llongan, llong un hwylbren

Slope, osgo: osgoi