From Longman Dictionary of Contemporary Englishdoerdo‧er /ˈduːə $ -ər/ noun [countable] DO informal someone who does things instead of just thinking or talking about them Dole is a doer, not a talker.
Examples from the Corpus
doer• You lose the pleasure of being a doer, as you become a manager of a growing organization.• They were both doers, and doers had to get out and do.• They also created a mythical patron, a just ruler who rewarded the good and punished evil doers by unleashing massive snowstorms.• The people of our grandparents' generation were doers, not talkers. 