Stool, maingc, ystôl

Stoop, plygu

Store, trysor, ystôr: trysori

Stork, ciconia

Storm, tymmestl; rhuthrgyrch

Stove, twymdy; twymiadur

Stout, mawr, cadarn

Strap, ffrewyll: ffrewyllu

Straw, gwellt

Stray, crwydryn: crwydro