scratcher vs worker

scratcher and worker both are nouns.

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

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

Other hypernyms of scratcher include actor, doer.

scratcher (noun)	worker (noun)
a device used for scratching	sterile member of a colony of social insects that forages for food and cares for the larvae
a person who scratches to relieve an itch	a person who works at a specific occupation
a workman who uses a tool for scratching	a member of the working class (not necessarily employed)
	a person who acts and gets things done