Reconstructions

PWS
*ṣhb - light-brown hue (Bulakh 2004: 278–279; Bulakh 2006: 211–212; Kogan 2011: 199)
PWS
*ṣmḳ - to press, to squeeze; to dry, to shrivel up (Kogan 2015: 306)
PWS
*ṣmm - to be deaf, to have a damaged ear (SED I No. 64ᵥ; Kogan 2011: 231)
PWS
*ṣVp(p)Vr- - (kind of small) bird (SED II No. 212)
PWS
*ṣpn - to hide, to cover (EDA I)
PWS
*ṣrb - to cut (Kogan 2015:575)
PWS
*ṣwb - to be fitting (SEDonline)

One wonders whether PWS *wṣb/*nṣb ‘to stand, to be erect; to be firm, stable’ may be further related as variant roots.

PWS
*ŝˁl - to be white, bright (Kogan 2015:36)
PWS
*ŝabḥ/*ŝVbḥ- - fat (SED I No. 261; Kogan 2015: 113)

Cf. *ŝaḥm- "fat", level?

PWS
*ŝgr - to entangle, to interweave (CDG 527, Kogan 2015:43)