substance abuser vs actor

substance abuser and actor both are nouns.

Word	Noun	Adjective	Verb	Adverb
substance abuser	Yes	No	No	No
actor	Yes	No	No	No

As nouns, actor is a hypernym of substance abuser; that is, actor is a word with a broader meaning than substance abuser:

Other hypernyms of substance abuser include doer, worker.

substance abuser (noun)	actor (noun)
a person who takes drugs	a theatrical performer
	a person who acts and gets things done