Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
Scottish Gaelic cèile
Proto-Celtic *kēlyos (inherited)
Primitive Irish ᚉᚓᚂᚔ (inherited)
Old Irish céile (inherited)

Scottish Gaelic fear-cèile (prefix)
Scottish Gaelic nighean-chèile (affix)
Scottish Gaelic dà-chèileachas (affix)