gas burner vs burner

gas burner and burner both are nouns.

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

As nouns, burner is a hypernym of gas burner; that is, burner is a word with a broader meaning than gas burner:

gas burner: burner such that combustible gas issues from a nozzle to form a steady flame
burner: an apparatus for burning fuel (or refuse)

gas burner (noun)	burner (noun)
burner such that combustible gas issues from a nozzle to form a steady flame	an apparatus for burning fuel (or refuse)
	the heating elements of a stove or range on which pots and pans are placed for cooking