Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
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English opponent
Proto-Indo-European *tḱey- (root)
Latin oppōnēns (borrowed)
Latin oppōnō (mention)

English foe (link)
English oppo (mention)
English oppone (mention)
English opponency (suffix)
Norwegian Bokmål motstander (link)