auto manufacturer vs auto maker

auto manufacturer and auto maker both are nouns.

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

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

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

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

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