ʸhom or šɔm - 1. sun; 2. day (CSOL I 660; CSOL I 694; CSOL II 627; LS 210, 418; Naumkin et al. 2015a:92)

PS
*yawm - day (Fronzaroli 1965a: 139, 141; Kogan 2011: 193, 196)
both ‘day’ and ‘24 hours’