The Proto-Indo-European word *dhwṓr
Word *dhwṓr
Meaning gate, door
See also Tocharian B: twere ‘door’

Comments
Arm. duṙ n/duṙ /tuṙ , Russ. dver', Skr. dvār, Av. dvarəm, Alb. derë, ON dyrr, Eng. duru/door, Gaul. doro, Gk. thura, Lith. durys, Ltv. durvis, Old Prussian dwaris, Lat. fores, Umbrian furo, Gm. tor/Tür, Ir. dorus/doras, Toch. --/twere, Kamviri du, Umbrian furo, Welsh dôr, Goth. daur, Polish drzwi, Pers. duvaraya/dar, Thrac. dur

Other words that might be of interest
*dṓm ‘house’, *trēbs ‘dwelling’, *weik̂- ‘village, clan’, *kus- ‘dwelling’, *k̂óimos ‘household, village’, *pḗr ‘house’, *solo/ehₐ~selo- ‘dwelling, settlement’, *dṓm ‘house, household, nuclear family’, *dóm(hₐ)os ‘house, household’, *h₂wóstu ‘dwelling’, *sedes- ‘seat’, *sedlom ‘seat’, *sedros ‘seat, chairlike object’, *tk̂ítis ‘settlement’