Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
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Proto-Indo-European *kʷetwóres

→ English four (mention)
→ English quarrel (derived)
→ English quadratic (derived)
→ English quarry (derived)
→ English tessellate (derived)
→ Avestan 𐬗𐬀𐬚𐬡𐬀𐬭 (inherited)
→ Afrikaans vier (mention)
→ Old English feower (derived)
→ Old English fiþer- (inherited)
→ Assamese চাৰি (inherited)
→ Baluchi چار (inherited)
→ Belarusian чатыры (derived)
→ Bulgarian четири (inherited)
→ Bengali চার (inherited)
→ Bengali চারি (inherited)
→ Breton pevar (inherited)
→ Breton peder (inherited)
→ Catalan quatre (inherited)
→ Cebuano kwatro (derived)
→ Central Kurdish چار (inherited)
→ Central Kurdish چوار (inherited)
→ Corsican quattru (inherited)
→ Czech čtyři (inherited)
→ Kashubian szterë (inherited)
→ Kashubian sztërë (inherited)
→ Old Church Slavonic четꙑре (derived)
→ Welsh pedwar (inherited)
→ Welsh pedair (mention)
→ Danish fire (inherited)
→ Danish kvart (derived)
→ German vier (mention)
→ Lower Sorbian styri (inherited)
→ Middle Dutch vier (mention)
→ Greek τέσσερις (inherited)
→ Greek τέσσερεις (inherited)
→ Spanish cuatro (inherited)
→ Persian چهار (inherited)
→ Faroese fýra (inherited)
→ French quatre (inherited)
→ French quadratique (mention)
→ Irish ceathair (inherited)
→ Scottish Gaelic ceithir (inherited)
→ Crimean Gothic fyder (inherited)
→ Old Swedish fiurir (derived)
→ Central Franconian vier (inherited)