bi-fold door vs interior door

bi-fold door and interior door both are nouns.

Word	Noun	Adjective	Verb	Adverb
bi-fold door	Yes	No	No	No
interior door	Yes	No	No	No

As nouns, interior door is a hypernym of bi-fold door; that is, interior door is a word with a broader meaning than bi-fold door:

bi-fold door (noun)	interior door (noun)
an interior door	a door that closes off rooms within a building