Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
German
achtzehn
←
Danish
atten
(cognate)
←
German
acht
(compound)
←
German
zehn
(compound)
←
English
eighteen
(cognate)
←
West Frisian
achttjin
(cognate)
←
Proto-Germanic
*ahtōutehun
(inherited)
←
Old High German
ahtozehan
(inherited)
←
Dutch
achttien
(cognate)
→
English
eighteen
(cognate)
→
Cimbrian
achtzane
(cognate)
→
German
achtzehnjährig
(suffix)
→
German
achtzehnfach
(suffix)
→
German
elfzehn
(mention)
→
German
achtzehnminütig
(affix)
→
German
Achtzehneck
(compound)
→
German
Achtzehn
(mention)
→
German
achtzehnwöchig
(affix)
→
German
achtzehnmal
(suffix)
→
Icelandic
átján
(cognate)
→
Dutch
achttien
(cognate)
→
Pennsylvania German
achtzeh
(cognate)
→
Pennsylvania German
achzeh
(cognate)
→
Yiddish
אַכצן
(cognate)