den vs room

den and room both are nouns.

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

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

den (noun)	room (noun)
a room that is comfortable and secluded	an area within a building enclosed by walls and floor and ceiling
a unit of 8 to 10 cub scouts	the people who are present in a room
the habitation of wild animals	space for movement
a hiding place; usually a remote place used by outlaws	opportunity for

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