Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
sinser
→
Irish
sinsear
(inherited)
→
Scottish Gaelic
sinnsear
(inherited)
→
Old Irish
sinserbráthair
(compound)
→
Old Irish
sinsersiur
(compound)