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Proto-Germanic *hrussą (inherited)
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Proto-Indo-European *kers- (derived)
→
English horse (inherited)
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Old English horsc (doublet)
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Northern East Cree ᐋᐦᐋᔅ (derived)
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Middle English hors (inherited)
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Old Swedish russ (cognate)
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Old Norse hross (cognate)
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Scots horse (inherited)