Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
Italian con
Proto-Indo-European *ḱóm (inherited)
Proto-Italic *kom (inherited)
Latin cum (inherited)

Corsican (cognate)
Italian collo (affix)
Italian colla (cognate)
Italian colle (affix)
Italian corrispettivo (prefix)
Italian concorrere (prefix)
Italian concrescere (prefix)
Italian convivere (prefix)
Italian conficcare (prefix)
Italian concittadino (prefix)
Italian combaciare (prefix)
Italian concentrico (confix)
Italian condirettore (prefix)
Italian compossibile (prefix)
Italian conciossiaché (compound)
Italian condebitore (prefix)
Italian condirezione (prefix)
Italian condirettrice (prefix)
Italian convalligiano (prefix)
Sardinian cun (cognate)
Venetian co (cognate)