PCS

*ṯ̣ūr- - mountain (Kogan 2015: 203; Kogan 2011: 190)

no trace in Arb, unless one compares ḏ̣iˀr- (pl. ḏ̣uˀār-) ‘the three stones upon which the cooking-pot is placed’

Akkadian
ṣūru - cliff, rock (Streck 2000:117)
M. Streck (2000:117) considers ṣūru ‘cliff, rock’ in an OB Gilgameš tablet from Tell Harmal a WS loanword, but a rare but authochnous Akkadian lexeme cannot be ruled out completely (Kogan 2015: 203)
Ugaritic
γr - mountain (DUL 324)
Hebrew
ṣūr - rock (HALOT 1016)
Jewish Babylonian Aramaic
ṭūrā - mountain (DJBA 498)
Syriac
ṭurā - mountain (LSyr. 272, SL 521)
Mandaic
ṭura - mountain, hill (MD 178)
Turoyo
ṭuro - mountain, mountain range (RW 540)
Sabaic
ṯ̣wr - mountain (SD 173)