door / dor are similar-sounding terms with different meanings (referred to as homophones). To better understand the differences, see below for definitions, pronunciation guides, and example sentences using each term. 👇
door: (noun) a swinging or sliding barrier that will close the entrance to a room or building or vehicle. (noun) anything providing a means of access (or escape). (noun) a structure where people live or work (usually ordered along a street or road). (noun) a room that is entered via a door.
dor: NA
door: d·AO·r
dor: NA
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)