rocket propellant vs rocket fuel

rocket propellant and rocket fuel both are nouns.

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

As nouns, rocket propellant and rocket fuel are synonyms defined as:

rocket propellant and rocket fuel: an explosive charge that propels a rocket

Other synonyms of rocket propellant include rocket propellent.

rocket propellant (noun)	rocket fuel (noun)
an explosive charge that propels a rocket	an explosive charge that propels a rocket