testate vs doer

testate and doer both are nouns.

Word	Noun	Adjective	Verb	Adverb
testate	Yes	Yes	No	No
doer	Yes	No	No	No

As nouns, doer is a hypernym of testate; that is, doer is a word with a broader meaning than testate:

Other hypernyms of testate include actor, worker.

testate (noun)	doer (noun)
a person who makes a will	a person who acts and gets things done

testate (adjective)	doer (adjective)
having made a legally valid will before death