riser vs actor

riser and actor both are nouns.

Word	Noun	Adjective	Verb	Adverb
riser	Yes	No	No	No
actor	Yes	No	No	No

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

Other hypernyms of riser include doer, worker.

riser (noun)	actor (noun)
structural member consisting of the vertical part of a stair or step	a theatrical performer
a vertical pipe in a building	a person who acts and gets things done
a person who rises (especially from bed)