Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
Scottish Gaelic luath
← Proto-Celtic *loutus (inherited)
← Welsh lludw (cognate)
← Scottish Gaelic luaithre (link)
← Old Irish lúath (inherited)
← Old Irish lúaith (inherited)

→ Welsh lludw (cognate)
→ Scottish Gaelic bàta-luath (affix)