solid-fuel rocket vs solid-propellant motor

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

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

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

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

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

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