rocket propellant vs burster

rocket propellant and burster both are nouns.

Word	Noun	Adjective	Verb	Adverb
rocket propellant	Yes	No	No	No
burster	Yes	No	No	No

As nouns, burster is a hypernym of rocket propellant; that is, burster is a word with a broader meaning than rocket propellant:

Other hypernyms of rocket propellant include bursting charge, charge, explosive charge, propellant, propellent.

rocket propellant (noun)	burster (noun)
an explosive charge that propels a rocket	a quantity of explosive to be set off at one time