Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
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English mer-
Old English mere- (inherited)
English mere (link)
English mercow (mention)
English mermaid (mention)
English merman (mention)
English mereswine (mention)
English mersnake (mention)
English merman (mention)
English mermaid (mention)
English merlady (mention)
English merfolk (mention)
English merwife (mention)
English mermonster (mention)
Middle English mere- (inherited)
Proto-Germanic *mari- (inherited)
Proto-Germanic *mari (derived)
Proto-Indo-European *mer- (sea) (root)

English merman (affix)
English mersalyl (affix)