washer vs worker

washer and worker both are nouns.

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

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

washer (noun)	worker (noun)
a home appliance for washing clothes and linens automatically	sterile member of a colony of social insects that forages for food and cares for the larvae
seal consisting of a flat disk placed to prevent leakage	a person who works at a specific occupation
someone who washes things for a living	a member of the working class (not necessarily employed)
	a person who acts and gets things done