exterior door vs outside door

exterior door and outside door both are nouns.

Word	Noun	Adjective	Verb	Adverb
exterior door	Yes	No	No	No
outside door	Yes	No	No	No

As nouns, exterior door and outside door are synonyms defined as:

exterior door and outside door: a doorway that allows entrance to or exit from a building

exterior door (noun)	outside door (noun)
a doorway that allows entrance to or exit from a building	a doorway that allows entrance to or exit from a building