auto maker vs auto manufacturer

auto maker and auto manufacturer both are nouns.

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

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

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

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

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