apartment vs rooms

apartment and rooms both are nouns.

Word	Noun	Adjective	Verb	Adverb
apartment	Yes	No	No	No
rooms	Yes	No	No	No

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

apartment: a suite of rooms usually on one floor of an apartment house
rooms: apartment consisting of a series of connected rooms used as a living unit (as in a hotel)

apartment (noun)	rooms (noun)
a suite of rooms usually on one floor of an apartment house	apartment consisting of a series of connected rooms used as a living unit (as in a hotel)