gas burner vs gas ring

gas burner and gas ring both are nouns.

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

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

gas burner: burner such that combustible gas issues from a nozzle to form a steady flame
gas ring: gas burner consisting of a circular metal pipe with several small holes through which gas can escape to be burned

Other hyponyms of gas burner include bunsen, bunsen burner, etna, pilot, pilot burner, pilot light.

gas burner (noun)	gas ring (noun)
burner such that combustible gas issues from a nozzle to form a steady flame	gas burner consisting of a circular metal pipe with several small holes through which gas can escape to be burned