Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
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Old Irish fo-
← Proto-Celtic *uɸo- (inherited)
← Old Irish fo (mention)

→ Irish ith (mention)
→ Irish fo- (derived)
→ Irish fuinneamh (mention)
→ Irish foscadh (mention)
→ Irish fiafraigh (mention)
→ Irish fógair (mention)
→ Scottish Gaelic fuiling (mention)
→ Old Irish ithid (affix)
→ Old Irish fogamar (affix)
→ Old Irish foceird (prefix)
→ Old Irish foloing (affix)
→ Old Irish foácaib (affix)
→ Old Irish focain (affix)
→ Old Irish focren (affix)
→ Old Irish fodáli (affix)
→ Old Irish fodaim (affix)
→ Old Irish fofera (affix)
→ Old Irish fofúasna (affix)
→ Old Irish fogaib (affix)
→ Old Irish fogeir (affix)
→ Old Irish foreith (affix)
→ Old Irish íarmifoich (affix)
→ Old Irish dofuiben (affix)
→ Old Irish irlam (affix)
→ Old Irish fochricc (affix)
→ Old Irish doaurchain (affix)
→ Old Irish doaurchain (mention)
→ Old Irish doaurling (affix)
→ Old Irish dofuthracair (affix)
→ Old Irish follus (affix)
→ Old Irish cobodlus (mention)
→ Old Irish folúathar (affix)
→ Old Irish fochlae (affix)
→ Old Irish fosisedar (affix)
→ Old Irish dofoirndea (affix)
→ Old Irish dufúairc (affix)
→ Old Irish fudumain (affix)
→ Old Irish fomuinethar (affix)