Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
gnó
←
Proto-Celtic
*gn-iy-
(mention)
←
Proto-Indo-European
*ǵenh₁-
(derived)
←
Old Irish
gnó
(inherited)
←
Old Irish
gníid
(mention)
→
Irish
gnóthach
(affix)
→
Irish
gnóthaigh
(mention)
→
Irish
gnólacht
(mention)