doer

Doer, m.

Etymology: [From Do, v. t. & i.]

1. One who does; one performs or executes; one who is wont and ready to act; an actor; an agent. The doers of the law shall be justified. Rom. ii. 13.

2. (Scots Law)

An agent or attorney; a factor. Burrill.

Shades of meaning

Fernald has no entry of its own for doer; he lists it under agent.

Where he writes about it:

In strict philosophical usage, the prime mover or doer of an act is the agent. — from agent

Synonyms

agent actor factor instrument means mover operator performer promoter

Antonyms

chief inventor originator principal

etymology Webster’s online