limo vs auto

limo and auto both are nouns.

Word	Noun	Adjective	Verb	Adverb
limo	Yes	No	No	No
auto	Yes	No	No	No

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

limo: large luxurious car; usually driven by a chauffeur
auto: a motor vehicle with four wheels; usually propelled by an internal combustion engine

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

limo (noun)	auto (noun)
large luxurious car; usually driven by a chauffeur	a motor vehicle with four wheels; usually propelled by an internal combustion engine