Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Polish
kruchy
←
Proto-Slavic
*kruxъ
(inherited)
→
Polish
kruchość
(affix)
→
Polish
krucho
(suffix)
→
Polish
kruszeć
(suffix)