inner vs interior

inner is not a noun while interior is a noun.

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

As adjectives, inner and interior are synonyms defined as:

Other synonyms of inner include internal.

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

inner (adjective)	interior (adjective)
located or occurring within or closer to a center	situated within or suitable for inside a building
exclusive to a center; especially a center of influence	inside the country
inside or closer to the inside of the body	of or coming from the middle of a region or country
innermost or essential	inside and toward a center
located inward	located inward
confined to an exclusive group