tower (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))
├── torr (Old English (ca. 450-1100))
│ └── turris (Latin)
│ └── τύρρις (Ancient Greek (to 1453))
└── tow (English)
└── togian (Old English (ca. 450-1100))
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