loose cannon vs actor

loose cannon and actor both are nouns.

Word	Noun	Adjective	Verb	Adverb
loose cannon	Yes	No	No	No
actor	Yes	No	No	No

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

loose cannon: a person who is expected to perform a particular task but who is out of control and dangerous
actor: a person who acts and gets things done

Other hypernyms of loose cannon include doer, worker.

loose cannon (noun)	actor (noun)
a person who is expected to perform a particular task but who is out of control and dangerous	a theatrical performer
	a person who acts and gets things done