Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Russian
ер
←
Old Church Slavonic
ѥръ
(borrowed)
→
English
yer
(mention)
→
English
jer
(derived)
→
Russian
словоерс
(mention)
→
Russian
одноеровый
(affix)