Reconstructions

PWS
*gbˀ - to return (Kogan 2015: 221 note 663)
PWS
*gVb(V)b-, gVb(b)-an- - hump, hunchback (SED I No. 67; Kogan 2011: 230)
The root is likely related to *ganb­- ‘side and back of torso’ (SED I No. 85). Though traditionally identified with Sem. *gbb ‘to be bent’ ([CDG 177], [DRS 94]), the present root is rather influenced by, than related to, the latter.
PWS
*gVbh(-at)- - forehead, front (SED I No. 68)
Related to *gabb(-at)- (with -h serving as a triconsonantizer?).
PWS
*gbl - to be massive, solid (Kogan 2015: 426 note 1223)
PWS
*gbn - to be curved, bowed, hunchback (SED I No. 67; CDG 178; Kogan 2015: 208, 224)
PWS
*ga/ibar - genital organ (SED I No. 70)
Rather to be separated from Sem. *gbr ‘to make; to force; be strong’ [CDG 178], [HALOT 175]
PWS
*gbṯ - hump (of an animal) (SED I No. 82; Kogan 2011: 230)
PWS
*gd - to be good, lucky, excellent (Kogan 2015: 191, Kogan 2015: 33, DRS 99‒100, 105‒106)
biconsonantal element
PWS
*gVd(V)l- - limb (SED I No. 73)
Possibly related to *gVd-at- with suffixed -l.
PWS
*gdy - to cut (DRS 100‒101)