Reconstructions

PS
*bVhVn- - thumb (SED I No. 34; Kogan 2011: 224)
PS
*bḥr - to choose, to test (EDA P 135)
PS
*bVkVr- - firstborn (Kogan 2014: 91)
PS
*baḳḳ- - gnat (SED II No. 58; Kogan 2011: 212)
PS
*bḳl - to sprout, to germinate (EDA B 68)
PS
*bVḳl- - a cultivated plant, seed, grain, cereal (Fronzaroli 1969b: 5, 24, 32; Kogan 2012: 245)
PS
*bVḳl- - shoot, plant, vegetable (EDA B 68)
PS
*bky - to weep (EDA I 148)
PS
*bik(ʷ)ay-, *bukay- - kind of insect or worm (SED II No. 57)
PS
*bVl(Vy) - without (Kogan 2015: 184)

The PCS negative particle *bal is likely related to this preposition (Arakelova 2001:25, Kogan 2015:184). There is also a possibility that *bVl(Vy) 'without' is ultimately connected to the PS root *bly 'to be worn out' (GAG § 114 r, Tropper 2000:771, Kogan 2015:184), although this is not generally accepted (Arakelova 2001:25, Pat-El 2013).