tearing down vs razing

tearing down and razing both are nouns.

Word	Noun	Adjective	Verb	Adverb
tearing down	Yes	No	No	No
razing	Yes	No	No	No

As nouns, tearing down and razing are synonyms defined as:

Other synonyms of tearing down include demolishing, leveling.

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