riser vs doer

riser and doer both are nouns.

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

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

Other hypernyms of riser include actor, worker.

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