Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Icelandic
vetni
←
French
hydrogène
(cognate)
←
Ancient Greek
ὕδωρ
(cognate)
←
Icelandic
vatn
(mention)
→
Icelandic
tvívetni
(prefix)
→
Icelandic
þrívetni
(prefix)
→
Icelandic
einvetni
(prefix)
→
Icelandic
ofurþungt vetni
(mention)