Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
tynnu
←
Proto-Indo-European
*ten-
(derived)
→
Welsh
tyn
(mention)
→
Irish
teann
(cognate)
→
Scottish Gaelic
teann
(cognate)