Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Esperanto
sekreto
←
Esperanto
sekretario
(doublet)
←
Proto-Indo-European
*krey-
(root)
←
Latin
sēcrētus
(derived)
←
Latin
sēcernō
(mention)
←
Latin
se-
(mention)
←
Latin
cernō
(mention)
→
Esperanto
sekretario
(doublet)
→
Esperanto
sekreta
(suffix)
→
Esperanto
sekreteco
(suffix)