left-hander vs worker

left-hander and worker both are nouns.

Word	Noun	Adjective	Verb	Adverb
left-hander	Yes	No	No	No
worker	Yes	No	No	No

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

left-hander: a person who uses the left hand with greater skill than the right
worker: a person who acts and gets things done

Other hypernyms of left-hander include actor, doer.

left-hander (noun)	worker (noun)
a person who uses the left hand with greater skill than the right	sterile member of a colony of social insects that forages for food and cares for the larvae
a baseball pitcher who throws the ball with the left hand	a person who works at a specific occupation
	a member of the working class (not necessarily employed)
	a person who acts and gets things done