Roman building vs building

Roman building and building both are nouns.

Word	Noun	Adjective	Verb	Adverb
Roman building	Yes	No	No	No
building	Yes	No	No	No

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

Roman building: a building constructed by the ancient Romans
building: a structure that has a roof and walls and stands more or less permanently in one place

Other hypernyms of Roman building include antiquity, edifice.

Roman building (noun)	building (noun)
a building constructed by the ancient Romans	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