burn down vs torch

burn down is not a noun while torch is a noun.

Word	Noun	Adjective	Verb	Adverb
burn down	No	No	Yes	No
torch	Yes	No	Yes	No

As verbs, torch is a hyponym of burn down; that is, torch is a word with a more specific, narrower meaning than burn down:

Other hyponyms of burn down include backfire, cremate, scorch.

burn down (noun)	torch (noun)
	a small portable battery-powered electric lamp
	a burner that mixes air and gas to produce a very hot flame
	a light usually carried in the hand; consists of some flammable substance
	tall-stalked very woolly mullein with densely packed yellow flowers; ancient Greeks and Romans dipped the stalks in tallow for funeral torches

burn down (verb)	torch (verb)
burn completely; be consumed or destroyed by fire	burn maliciously, as by arson
destroy by fire