Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
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Icelandic eyja
Proto-Germanic *awjō (derived)
Icelandic ey (mention)
Icelandic eyju (mention)
Old Norse ey (derived)

Icelandic Eyjafjallajökull (mention)
Icelandic Jólaeyja (compound)
Old Norse ey (link)