hopped-up vs auto

hopped-up is not a noun while auto is a noun.

Word	Noun	Adjective	Verb	Adverb
hopped-up	No	Yes	No	No
auto	Yes	No	No	No

hopped-up (noun)	auto (noun)
	a motor vehicle with four wheels; usually propelled by an internal combustion engine

hopped-up (adjective)	auto (adjective)
under the influence of narcotics, especially cannabis
(of an automobile) having the engine modified to give extra power