riser vs worker

riser and worker both are nouns.

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

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

Other hypernyms of riser include actor, doer.

riser (noun)	worker (noun)
structural member consisting of the vertical part of a stair or step	sterile member of a colony of social insects that forages for food and cares for the larvae
a vertical pipe in a building	a person who works at a specific occupation
a person who rises (especially from bed)	a member of the working class (not necessarily employed)
	a person who acts and gets things done