Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
taith
←
Proto-Celtic
*tixtā
(derived)
←
Proto-Celtic
*tēgeti
(mention)
←
Old Irish
techt
(cognate)
→
Welsh
teithio
(suffix)
→
Welsh
ymdaith
(affix)