opium den vs building

opium den and building both are nouns.

Word	Noun	Adjective	Verb	Adverb
opium den	Yes	No	No	No
building	Yes	No	No	No

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

opium den: a building where opium is sold and used
building: a structure that has a roof and walls and stands more or less permanently in one place

Other hypernyms of opium den include edifice.

opium den (noun)	building (noun)
a building where opium is sold and used	the act of constructing something
	the commercial activity involved in repairing old structures or constructing new ones
	a structure that has a roof and walls and stands more or less permanently in one place
	the occupants of a building