rocket fuel vs bursting charge

rocket fuel and bursting charge both are nouns.

Word	Noun	Adjective	Verb	Adverb
rocket fuel	Yes	No	No	No
bursting charge	Yes	No	No	No

As nouns, bursting charge is a hypernym of rocket fuel; that is, bursting charge is a word with a broader meaning than rocket fuel:

Other hypernyms of rocket fuel include burster, charge, explosive charge, propellant, propellent.

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