Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
Welsh eira
← Breton erc'h (cognate)
← Proto-Brythonic *ėrɣ (inherited)
← Cornish ergh (cognate)

→ Welsh Gwyneira (affix)
→ Welsh eirlys (compound)
→ Welsh eirlithrad (affix)
→ Welsh eirwynt (affix)
→ Welsh plu eira (affix)