station waggon vs auto

station waggon and auto both are nouns.

Word	Noun	Adjective	Verb	Adverb
station waggon	Yes	No	No	No
auto	Yes	No	No	No

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

station waggon: a car that has a long body and rear door with space behind rear seat
auto: a motor vehicle with four wheels; usually propelled by an internal combustion engine

Other hypernyms of station waggon include automobile, car, machine, motorcar.

station waggon (noun)	auto (noun)
a car that has a long body and rear door with space behind rear seat	a motor vehicle with four wheels; usually propelled by an internal combustion engine