signatory vs actor

signatory and actor both are nouns.

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

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

Other hypernyms of signatory include doer, worker.

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