multistage rocket vs step rocket

multistage rocket and step rocket both are nouns.

Word	Noun	Adjective	Verb	Adverb
multistage rocket	Yes	No	No	No
step rocket	Yes	No	No	No

As nouns, multistage rocket and step rocket are synonyms defined as:

multistage rocket and step rocket: a rocket having two or more rocket engines (each with its own fuel) that are fired in succession and jettisoned when the fuel is exhausted

multistage rocket (noun)	step rocket (noun)
a rocket having two or more rocket engines (each with its own fuel) that are fired in succession and jettisoned when the fuel is exhausted	a rocket having two or more rocket engines (each with its own fuel) that are fired in succession and jettisoned when the fuel is exhausted