Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old High German
-ist
→
Old High German
erist
(affix)
→
Old High German
dekkist
(affix)
→
Luxembourgish
-st
(inherited)