Sur-plus, gwarled, gweddill
Sur-prise, syndod, aruthraw: dyrysu
Sur-round, cylchynu, cwmpasu
Sur-vey, golwg; mesur: arolygu, mesur
Sur-vive, gorfucheddu, oloesi
Sus-pect, drwgdyb: drwgdybio
Sus-pend, crogi wrth; oedi, gohirio
Sus-pense, amheuaeth, oediad
Sus-tain, cynnal, cynnorthwyo, porthi, helpio; goddef
Swad-dle, ffunen, rhwymyn: ffunenu, rhwymynu