servant vs worker

servant and worker both are nouns.

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

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

servant: a person working in the service of another (especially in the household)
worker: a person who works at a specific occupation

servant (noun)	worker (noun)
a person working in the service of another (especially in the household)	sterile member of a colony of social insects that forages for food and cares for the larvae
in a subordinate position	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