Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
Tamil ஒன்று
← Proto-Dravidian *onṯu (inherited)
← Kannada ಒಂದು (cognate)
← Malayalam ഒന്നു (cognate)
← Tulu ಒಂಜಿ (cognate)
← Telugu ఒణ్డు (cognate)

→ Kannada ಒಂದು (cognate)
→ Tamil ஒற்றுமை (suffix)
→ Tamil ஒன்றாக (mention)