erection vs building

erection and building both are nouns.

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

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

Other hypernyms of erection include construction.

erection (noun)	building (noun)
the act of building or putting up	the act of constructing something
a structure that has been erected	the commercial activity involved in repairing old structures or constructing new ones
an erect penis	a structure that has a roof and walls and stands more or less permanently in one place
	the occupants of a building