auto vs hopped-up

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

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

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

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