erecting vs building

erecting and building both are nouns.

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

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

Other hypernyms of erecting include construction.

erecting (noun)	building (noun)
the act of building or putting up	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