SUV vs sport utility

SUV and sport utility both are nouns.

Word	Noun	Adjective	Verb	Adverb
SUV	Yes	No	No	No
sport utility	Yes	No	No	No

As nouns, SUV and sport utility are synonyms defined as:

SUV and sport utility: a high-performance four-wheel drive car built on a truck chassis

Other synonyms of SUV include S.U.V., sport utility vehicle.

SUV (noun)	sport utility (noun)
a high-performance four-wheel drive car built on a truck chassis	a high-performance four-wheel drive car built on a truck chassis