The exterior of a building or vehicle is the outside part of it.
Exterior is often used as an adjective in front of a noun to refer to an outside part of a building or vehicle.
External can be used in front of a noun to refer to an outside part of a building.
External can be used in front of other nouns to refer to things which happen, come from, or exist outside a place or area of activity.
You cannot use exterior in this way.
Noun | 1. | ![]() open air, outdoors, out-of-doors, open - where the air is unconfined; "he wanted to get outdoors a little"; "the concert was held in the open air"; "camping in the open" |
2. | exterior - the outer side or surface of something surface - the extended two-dimensional outer boundary of a three-dimensional object; "they skimmed over the surface of the water"; "a brush small enough to clean every dental surface"; "the sun has no distinct surface" | |
Adj. | 1. | exterior - situated in or suitable for the outdoors or outside of a building; "an exterior scene"; "exterior grade plywood"; "exterior paints" outdoor, out-of-door, outside - located, suited for, or taking place in the open air; "outdoor clothes"; "badminton and other outdoor games"; "a beautiful outdoor setting for the wedding" interior - situated within or suitable for inside a building; "an interior scene"; "interior decoration"; "an interior bathroom without windows" |