room vs houseroom

room and houseroom both are nouns.

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

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

room (noun)	houseroom (noun)
an area within a building enclosed by walls and floor and ceiling	space for accommodation in a house
the people who are present in a room
space for movement
opportunity for

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