(n) scallop
(n) (comp) scalar variable
(n,vs) scratch
(n,vs) scrap
(P)
(n) (1) scalar
(n) scorer
(n) scholasticism
(n) stylus
(n,vs) strike
(P)
(n) strike
(P)
(n) stride
(n) stripe
(P)
(n) strap (often decorative for key-holder, mobile phones, etc.)
(n) spiral
(P)
(n) spatula
(n,vs) splice
(n) (comp) sprite
(n) spline
(n) spoiler
(n) Sumatran rhinoceros (Dicerorhinus sumatrensis)
(n) slicer
(n) slider (usu. volume control)
(P)
(n) sliding scale system
(n) sliver (strand of loose fibers)
(n) thruster (e.g. on a satellite)
(n) slugger
(n) slacks
(P)
(n,vs) slash character (ASCII 057)
(n) Slavic (branch of languages)
(n) slub yarn (yarn with lumps, thickening, etc.)