Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Scottish Gaelic
amaideach
←
Scottish Gaelic
amaideachd
(back-formation)
←
Scottish Gaelic
-achd
(mention)
←
Scottish Gaelic
-ach
(affix)