rocket propellant vs rocket propellent

rocket propellant and rocket propellent both are nouns.

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

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

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

Other synonyms of rocket propellant include rocket fuel.

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