Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
English
abstruse
←
German
abstrus
(cognate)
←
French
abstrus
(borrowed)
←
Proto-Indo-European
*trewd-
(root)
←
Latin
abstrūsus
(borrowed)
←
Latin
abstrūdō
(mention)
←
Latin
ab
(mention)
←
Latin
abs
(mention)
←
Latin
trūdō
(mention)
→
English
abstrude
(mention)
→
English
abstrusely
(suffix)
→
English
abstruseness
(suffix)
→
English
abstrusion
(mention)
→
English
abstrusity
(suffix)
→
English
abstrusive
(suffix)