classroom vs room

classroom and room both are nouns.

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

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

classroom (noun)	room (noun)
a room in a school where lessons take place	an area within a building enclosed by walls and floor and ceiling
	the people who are present in a room
	space for movement
	opportunity for

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