carmaker vs car manufacturer

carmaker and car manufacturer both are nouns.

Word	Noun	Adjective	Verb	Adverb
carmaker	Yes	No	No	No
car manufacturer	Yes	No	No	No

As nouns, carmaker and car manufacturer are synonyms defined as:

carmaker and car manufacturer: a business engaged in the manufacture of automobiles

Other synonyms of carmaker include auto maker, auto manufacturer, automaker, car maker.

carmaker (noun)	car manufacturer (noun)
a business engaged in the manufacture of automobiles	a business engaged in the manufacture of automobiles