burner vs blowtorch

burner and blowtorch both are nouns.

Word	Noun	Adjective	Verb	Adverb
burner	Yes	No	No	No
blowtorch	Yes	No	No	No

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

Other hyponyms of burner include blowlamp, torch, gas bracket, gas burner, gas jet.

burner (noun)	blowtorch (noun)
an apparatus for burning fuel (or refuse)	a burner that mixes air and gas to produce a very hot flame
the heating elements of a stove or range on which pots and pans are placed for cooking