interior vs indoor

interior is a noun but indoor is not a noun.

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

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

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