auto manufacturer vs automaker

auto manufacturer and automaker both are nouns.

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

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

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

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

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