testator vs worker

testator and worker both are nouns.

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

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

Other hypernyms of testator include actor, doer.

testator (noun)	worker (noun)
a person who makes a will	sterile member of a colony of social insects that forages for food and cares for the larvae
	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