Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
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Romanian plug
Proto-Germanic *plōgaz (derived)
Proto-Germanic *plōguz (mention)
Proto-Slavic *plugъ (derived)

Romanian ara (link)
Romanian arat (mention)
Romanian arat (link)
Romanian plugar (suffix)
Romanian pluguleț (suffix)
Romanian pluguț (suffix)
Romanian plugușor (suffix)
Aromanian plug (cognate)