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

→ Persian خواب (derived)
→ Persian خفتن (derived)
→ Hindi सोना (root)
→ Hindi ख़्वाब (root)
→ Hindi स्वप्न (root)
→ Hindi सपना (root)
→ Hindi ख़्वाबगाह (root)
→ Maithili सपना (root)
→ Nepali सपना (root)
→ Urdu خواب (root)
→ Urdu سپنا (root)