torch vs burn down

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

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

As verbs, burn down is a hypernym of torch; that is, burn down is a word with a broader meaning than torch:

Other hypernyms of torch include burn, fire.

torch (noun)	burn down (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

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