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 *dwóh₁

→ English two (inherited)
→ English twig (mention)
→ English doubt (derived)
→ English duo (derived)
→ English dyad (mention)
→ English twine (mention)
→ English twine (derived)
→ English twain (derived)
→ English twin (mention)
→ English twin (derived)
→ English biennium (mention)
→ English twi- (derived)
→ English bivious (derived)
→ English douzeper (derived)
→ Avestan 𐬛𐬎𐬎𐬀 (inherited)
→ Afrikaans twee (derived)
→ Assamese দুই (inherited)
→ Ashkun vadu (mention)
→ Baluchi دو (inherited)
→ Belarusian два (derived)
→ Bulgarian два (inherited)
→ Bhojpuri दू (derived)
→ Bengali দুই (inherited)
→ Bakhtiari دیه (derived)
→ Breton daou (inherited)
→ Catalan dos (inherited)
→ Central Kurdish دوو (inherited)
→ Corsican dui (inherited)
→ Czech dva (derived)
→ Kashubian dwa (inherited)
→ Old Church Slavonic дъва (derived)
→ Welsh dau (inherited)
→ Welsh dwy (mention)
→ Danish to (derived)
→ Lower Sorbian dwa (inherited)
→ Greek δύο (mention)
→ Middle English twei (derived)
→ Esperanto du (derived)
→ Spanish dos (inherited)
→ Persian دو (inherited)
→ Persian دیگر (derived)
→ Faroese tveir (inherited)
→ French deux (inherited)
→ Irish dó (inherited)
→ Irish dhá (derived)
→ Scottish Gaelic dà (inherited)
→ Scottish Gaelic dhà (inherited)
→ Crimean Gothic tua (inherited)
→ Westrobothnian to (inherited)
→ Jersey Dutch twî (inherited)
→ Old High German zwene (inherited)
→ Gothic 𐍄𐍅𐌰𐌹 (inherited)
→ Ancient Greek δύο (inherited)
→ Ancient Greek Ταυλάντιοι (mention)