Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Czech
plch
←
Proto-Slavic
*pъlxъ
(inherited)
→
German
Bilch
(cognate)
→
Lower Sorbian
pjelch
(cognate)