Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
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Welsh dau
← Proto-Brythonic *dọw (inherited)
← Proto-Celtic *dwau (inherited)
← Proto-Indo-European *dwóh₁ (inherited)

→ English deuddarn (mention)
→ Welsh deusaith (compound)
→ Welsh deuddeg (compound)
→ Welsh un deg dau (compound)
→ Welsh deugain (compound)
→ Welsh Aberdaugleddau (compound)
→ Welsh deuparth (compound)
→ Welsh deuaidd (affix)
→ Welsh dau ar bymtheg (compound)
→ Welsh deunaw (compound)
→ Welsh dau ar hugain (compound)
→ Welsh deulo (affix)
→ Welsh dau ddeg (compound)
→ Welsh dau ddeg un (compound)
→ Welsh dau ddeg dau (compound)
→ Welsh dau ddeg dau (compound)
→ Welsh dau ddeg tri (compound)
→ Welsh dau ddeg pedwar (compound)
→ Welsh dau ddeg pump (compound)
→ Welsh dau ddeg chwech (compound)
→ Welsh dau ddeg saith (compound)
→ Welsh dau ddeg wyth (compound)
→ Welsh dau ddeg naw (compound)
→ Welsh dau ddeg dwy (compound)
→ Welsh dau ddeg tair (compound)
→ Welsh dau ddeg pedair (compound)