demolishing vs razing

demolishing and razing both are nouns.

Word	Noun	Adjective	Verb	Adverb
demolishing	Yes	No	No	No
razing	Yes	No	No	No

As nouns, demolishing and razing are synonyms defined as:

Other synonyms of demolishing include leveling, tearing down.

demolishing (noun)	razing (noun)
complete destruction of a building	complete destruction of a building
	the event of a structure being completely demolished and leveled