Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Esperanto
konstrui kastelojn en la aero
←
Danish
luftkastel
(cognate)
←
German
Luftschoss
(cognate)
←
English
castle in the air
(cognate)
←
Dutch
luchtkasteel
(cognate)