a person or thing that does something, esp. a person who gets things done with vigor and efficiency.

a person characterized by action, as distinguished from one given to contemplation.

Australian . an amusing or eccentric person; character.

noun

achiever , busy person , dynamo * , energetic person , man of action , motivator , mover and shaker * , risk-taker , woman of action , activist , actor , dynamo , executant , go-getter , hustler , performer , worker