interior vs inner

interior is a noun but inner is not a noun.

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

As adjectives, interior and inner are synonyms defined as:

Other synonyms of interior include internal.

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

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