exterior vs outdoor

exterior is a noun but outdoor is not a noun.

Word	Noun	Adjective	Verb	Adverb
exterior	Yes	Yes	No	No
outdoor	No	Yes	No	No

exterior (noun)	outdoor (noun)
the outer side or surface of something
the region that is outside of something

exterior (adjective)	outdoor (adjective)
situated in or suitable for the outdoors or outside of a building	located, suited for, or taking place in the open air
	pertaining to or concerning the outdoors or outdoor activities