automaker vs car maker

automaker and car maker both are nouns.

Word	Noun	Adjective	Verb	Adverb
automaker	Yes	No	No	No
car maker	Yes	No	No	No

As nouns, automaker and car maker are synonyms defined as:

automaker and car maker: a business engaged in the manufacture of automobiles

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

automaker (noun)	car maker (noun)
a business engaged in the manufacture of automobiles	a business engaged in the manufacture of automobiles