Jet and Pilot burner

Jet noun - A usually forceful stream of fluid discharged from a narrow opening.

Pilot burner and jet are semantically related In some cases you can use "Pilot burner" instead a noun "Jet".

Pilot burner noun - Small auxiliary gas burner that provides a flame to ignite a larger gas burner.

Jet and pilot burner are semantically related in gas burner topic. You can use "Jet" instead a noun phrase "Pilot burner", if it concerns topics such as laboratory gas burner.