automaker vs auto manufacturer

automaker and auto manufacturer both are nouns.

Word	Noun	Adjective	Verb	Adverb
automaker	Yes	No	No	No
auto manufacturer	Yes	No	No	No

As nouns, automaker and auto manufacturer are synonyms defined as:

automaker and auto manufacturer: a business engaged in the manufacture of automobiles

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

automaker (noun)	auto manufacturer (noun)
a business engaged in the manufacture of automobiles	a business engaged in the manufacture of automobiles