pilot burner vs gas jet

pilot burner and gas jet both are nouns.

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

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

pilot burner: small auxiliary gas burner that provides a flame to ignite a larger gas burner
gas jet: burner such that combustible gas issues from a nozzle to form a steady flame

Other hypernyms of pilot burner include gas burner.

pilot burner (noun)	gas jet (noun)
small auxiliary gas burner that provides a flame to ignite a larger gas burner	burner such that combustible gas issues from a nozzle to form a steady flame