boiler (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))
└── boil (English)
├── bile (Middle English (1100-1500))
│ └── byl (Old English (ca. 450-1100))
└── boillen (Middle English (1100-1500))
└── boillir (Old French (842-ca. 1400))
└── bullire (Latin)
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