A person unusually humorous, reckless, undisciplined, immoral or eccentric.

One who does; one who performs or executes; one who is wont and ready to act; an actor; an agent.

a person who acts and gets things done; "he's a principal actor in this affair"; "when you want something done get a doer"; "he's a miracle worker"

an actor that performs an activity

NYPD shorthand for the person that commits a crime, usually a murderer.

Division of Energy Resources. The DOER is a state agency that implements energy policies that ensure an adequate supply of reliable, affordable, and clean energy for the businesses and residents of Massachusetts. It seeks to improve and streamline energy regulation, promote greater efficiency in all energy applications, reduce energy costs, and mobilize energy education.

An agent or attorney; a factor.