electric automobile vs electric car

electric automobile and electric car both are nouns.

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

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

electric automobile and electric car: a car that is powered by electricity

Other synonyms of electric automobile include electric.

electric automobile (noun)	electric car (noun)
a car that is powered by electricity	a car that is powered by electricity