PWS

*ḥadr-/*ḫadr- - inner room, living quarters (Kogan 2015: 82)

*ḫ in Arabic, ESA, EthS and MSA vs. *ḥ in Ugaritic and Ebla. Perhaps also Soq. ḥdr ‘s’arrêter’ (LS 165), attested in Müller 1905:287 (ḥedaíroh ‘sie ließ sich nieder’)

Ugaritic
ḥdr - room, chamber (DUL 355)
Hebrew
ḥädär - dark room (HALOT 293)
Arabic
ḫidr- - a chamber that conceals a person (Lane 708)
Sabaic
ḫdr - chamber (SD 59)
Qatabanian
ḫdr - trading stall (LIQ 70)
Geez
ḫadara - to dwell, to reside (CDG 258)
Mehri
ḫədōr - to put up a sunshade, shelter, tent (ML 438)
Jibbali
ḫádər - cave used as a house or pen (JL 298)