indoor vs interior

indoor is not a noun while interior is a noun.

Word	Noun	Adjective	Verb	Adverb
indoor	No	Yes	No	No
interior	Yes	Yes	No	No

indoor (noun)	interior (noun)
	the inner or enclosed surface of something
	the region that is inside of something

indoor (adjective)	interior (adjective)
located, suited for, or taking place within a building	situated within or suitable for inside a building
within doors	inside the country
	of or coming from the middle of a region or country
	inside and toward a center
	located inward