doubter vs actor

doubter and actor both are nouns.

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

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

Other hypernyms of doubter include doer, worker.

doubter (noun)	actor (noun)
someone who habitually doubts accepted beliefs	a theatrical performer
someone who is doubtful or noncommittal about something	a person who acts and gets things done