West Frisian doar

← Proto-Germanic *durz (inherited)

← Proto-Indo-European *dʰwer- (root)

← Proto-Indo-European *dʰwer- (derived)

← Old Frisian dure (inherited)

← Old Frisian dore (mention)

→ English door (cognate)

→ North Frisian dör (mention)

→ North Frisian döör (mention)