signatory vs doer

signatory and doer both are nouns.

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

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

Other hypernyms of signatory include actor, worker.

signatory (noun)	doer (noun)
someone who signs and is bound by a document	a person who acts and gets things done