solid-fuel rocket vs solid propellant rocket

solid-fuel rocket and solid propellant rocket both are nouns.

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

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

solid-fuel rocket and solid propellant rocket: A chemical rocket engine which uses propellant in a solid state.

Other synonyms of solid-fuel rocket include solid-propellant motor.

solid-fuel rocket (noun)	solid propellant rocket (noun)
A chemical rocket engine which uses propellant in a solid state.	A chemical rocket engine which uses propellant in a solid state.