Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
ceathair
←
Proto-Celtic
*kʷetwares
(inherited)
←
Proto-Celtic
*kʷetwr̥es
(inherited)
←
Proto-Indo-European
*kʷetwóres
(inherited)
←
Old Irish
cethair
(inherited)
→
Irish
ceathrú
(affix)
→
Irish
col ceathar
(mention)
→
Irish
ceathrúil
(affix)