signer vs actor

signer and actor both are nouns.

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

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

Other hypernyms of signer include doer, worker.

signer (noun)	actor (noun)
someone who signs and is bound by a document	a theatrical performer
someone who can use sign language to communicate	a person who acts and gets things done