admission vs door

admission and door both are nouns.

Word	Noun	Adjective	Verb	Adverb
admission	Yes	No	No	No
door	Yes	No	No	No

As nouns, door is a hyponym of admission; that is, door is a word with a more specific, narrower meaning than admission:

admission (noun)	door (noun)
the act of admitting someone to enter	a swinging or sliding barrier that will close the entrance to a room or building or vehicle
the right to enter	the entrance (the space in a wall) through which you enter or leave a room or building; the space that a door can close
an acknowledgment of the truth of something	a room that is entered via a door
the fee charged for admission	a structure where people live or work (usually ordered along a street or road)
	anything providing a means of access (or escape)