firestorm (English)
├── fire (English)
│ └── fier (Middle English (1100-1500))
│ └── fyr (Old English (ca. 450-1100))
└── storm (English)
├── storm (Middle English (1100-1500))
│ └── storm (Old English (ca. 450-1100))
└── stormen (Middle English (1100-1500))
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