Model T vs auto

Model T and auto both are nouns.

Word	Noun	Adjective	Verb	Adverb
Model T	Yes	No	No	No
auto	Yes	No	No	No

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

Model T: the first widely available automobile powered by a gasoline engine; mass-produced by Henry Ford from 1908 to 1927
auto: a motor vehicle with four wheels; usually propelled by an internal combustion engine

Other hypernyms of Model T include automobile, car, machine, motorcar.

Model T (noun)	auto (noun)
the first widely available automobile powered by a gasoline engine; mass-produced by Henry Ford from 1908 to 1927	a motor vehicle with four wheels; usually propelled by an internal combustion engine