building vs leveling

building and leveling both are nouns.

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

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

building: the act of constructing something
leveling: changing the ground level to a smooth horizontal or gently sloping surface

building (noun)	leveling (noun)
the act of constructing something	the act of making equal or uniform
the commercial activity involved in repairing old structures or constructing new ones	complete destruction of a building
a structure that has a roof and walls and stands more or less permanently in one place	changing the ground level to a smooth horizontal or gently sloping surface
the occupants of a building