optimist vs actor

optimist and actor both are nouns.

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

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

Other hypernyms of optimist include doer, worker.

optimist (noun)	actor (noun)
a person disposed to take a favorable view of things	a theatrical performer
	a person who acts and gets things done