Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
English eachother
Old English ǣlċ ōþer (inherited)
English each (affix)
English other (affix)
English each other (mention)
Middle English ech other (inherited)
Middle English yche othere (mention)
Middle English ich othir (mention)
Middle English eche other (mention)
Middle English ilk oþer (mention)