hybrid car vs auto

hybrid car and auto both are nouns.

Word	Noun	Adjective	Verb	Adverb
hybrid car	Yes	No	No	No
auto	Yes	No	No	No

As nouns, auto is a hypernym of hybrid car; that is, auto is a word with a broader meaning than hybrid car:

hybrid car: a car which runs on two power sources, usually an internal combustion engine and an electronic motor
auto: a motor vehicle with four wheels; usually propelled by an internal combustion engine

Other hypernyms of hybrid car include automobile, car, machine, motorcar.

hybrid car (noun)	auto (noun)
a car which runs on two power sources, usually an internal combustion engine and an electronic motor	a motor vehicle with four wheels; usually propelled by an internal combustion engine