clearance vs room

clearance and room both are nouns.

Word	Noun	Adjective	Verb	Adverb
clearance	Yes	No	No	No
room	Yes	No	Yes	No

As nouns, room is a hypernym of clearance; that is, room is a word with a broader meaning than clearance:

Other hypernyms of clearance include elbow room, way.

clearance (noun)	room (noun)
permission to proceed	an area within a building enclosed by walls and floor and ceiling
the distance by which one thing clears another; the space between them	the people who are present in a room
vertical space available to allow easy passage under something	space for movement
	opportunity for

clearance (verb)	room (verb)
	live and take one's meals at or in