thinker (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))
└── think (English)
└── thinken (Middle English (1100-1500))
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