Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
teg
←
Cornish
teg
(cognate)
→
Welsh
tecaf
(suffix)
→
Welsh
Tegwen
(compound)
→
Welsh
-af
(mention)
→
Welsh
teced
(suffix)
→
Welsh
tecach
(suffix)
→
Welsh
tegan
(affix)
→
Welsh
tegwch
(suffix)
→
Welsh
annheg
(prefix)
→
Cornish
teg
(cognate)