Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Scottish Gaelic
beathach
←
Irish
beithíoch
(cognate)
←
Scottish Gaelic
-ach
(affix)
←
Middle Irish
betha
(derived)
←
Old Irish
bethach
(inherited)
←
Old Irish
bethadach
(mention)
←
Old Irish
bethu
(mention)