transporter vs car transporter

transporter and car transporter both are nouns.

Word	Noun	Adjective	Verb	Adverb
transporter	Yes	No	No	No
car transporter	Yes	No	No	No

As nouns, transporter and car transporter are synonyms defined as:

transporter and car transporter: a long truck for carrying motor vehicles

transporter (noun)	car transporter (noun)
a moving belt that transports objects (as in a factory)	a long truck for carrying motor vehicles
a crane for moving material with dispatch as in loading and unloading ships
a long truck for carrying motor vehicles