automobile factory vs car factory

automobile factory and car factory both are nouns.

Word	Noun	Adjective	Verb	Adverb
automobile factory	Yes	No	No	No
car factory	Yes	No	No	No

As nouns, automobile factory and car factory are synonyms defined as:

automobile factory and car factory: a factory where automobiles are manufactured

Other synonyms of automobile factory include auto factory.

automobile factory (noun)	car factory (noun)
a factory where automobiles are manufactured	a factory where automobiles are manufactured