burster vs rocket fuel

burster and rocket fuel both are nouns.

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

As nouns, rocket fuel is a hyponym of burster; that is, rocket fuel is a word with a more specific, narrower meaning than burster:

Other hyponyms of burster include shot, undercharge, rocket propellant, rocket propellent.

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