Akkadian

šērtu - (a characteristic such as brilliance) (CAD Š₂ 327)

PS
*ŝahr- - moon (Kogan 2015:41, note 96)

Kogan 2015: “It is uncertain to what extent *ŝahr- was synonymous to *war(i)ḫ- in PS: could the former designate specifically the “new moon,” “crescent”?”