test instrument vehicle vs research rocket

test instrument vehicle and research rocket both are nouns.

Word	Noun	Adjective	Verb	Adverb
test instrument vehicle	Yes	No	No	No
research rocket	Yes	No	No	No

As nouns, test instrument vehicle and research rocket are synonyms defined as:

test instrument vehicle and research rocket: a rocket fired for test purposes

Other synonyms of test instrument vehicle include test rocket.

test instrument vehicle (noun)	research rocket (noun)
a rocket fired for test purposes	a rocket fired for test purposes