Inside the Universes

'doer'

[actor.n.02] as in: a person who acts and gets things done

Examples:
he's a principal actor in this affair
when you want something done get a doer
he's a miracle worker

Origins

					doer (English)
├── -er (English)
│   ├── -er (Middle English (1100-1500))
│   ├── -eren (Middle English (1100-1500))
│   ├── -or (Old English (ca. 450-1100))
│   └── -ra (Old English (ca. 450-1100))
└── do (English)
    ├── do (Italian)
    └── don (Middle English (1100-1500))
        └── don (Old English (ca. 450-1100))