interior vs internal

interior is a noun but internal is not a noun.

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

As adjectives, interior and internal are synonyms defined as:

Other synonyms of interior include home, national.

As adjectives, interior and internal are synonyms defined as:

Other synonyms of interior include inner.

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

interior (adjective)	internal (adjective)
situated within or suitable for inside a building	happening or arising or located within some limits or especially surface
inside the country	inside the country
of or coming from the middle of a region or country	occurring within an institution or community
inside and toward a center	innermost or essential
located inward	located inward