Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
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Italian o
Italian od (alter)
Italian (alter)
Italian used optionally before words beginning with a vowel (alter)
Latin ō (inherited)
Latin O (mention)
Latin aut (inherited)

Corsican o (cognate)
Extremaduran o (cognate)
Italian oppure (affix)
Italian incasso (confix)
Italian oddio (compound)
Italian telematico (suffix)
Italian spoonerismo (suffix)
Italian sfingeo (suffix)