Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
seacht
←
Proto-Celtic
*sextam
(inherited)
←
Proto-Indo-European
*septḿ̥
(inherited)
←
Old Irish
secht
(inherited)
→
Irish
seachtar
(mention)
→
Irish
seachtar
(link)
→
Irish
seacht-
(mention)
→
Irish
7ain
(mention)
→
Manx
shiaght
(cognate)