Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
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English referendum
Latin referendus (derived)
Latin refero (mention)

English -um (link)
English antireferendum (prefix)
English neverendum (blend)
English preferendum (blend)
English Indyref (mention)
English Indyref2 (mention)
German Referendum (cognate)
Japanese レファレンダム (borrowed)
Tagalog reperendum (borrowed)