fisher

The word 'fisher' is a transparent English compound built from native Germanic elements. Its first element, 'fish', descends from the Proto-Germanic fiskaz, itself from the Proto-Indo-European root peisk- meaning "fish". The second element, the agentive suffix '-er', originates from the Proto-Germanic -ārijaz, a borrowing from Latin '-arius'. The word's literal construction, "one who fishes", has remained semantically stable since Old English 'fiscere'. The application of the term to a specific mammal in the 19th century is an American English development, likely derived from 'fisher cat', named perhaps for its perceived skill in catching fish or its resemblance to the European polecat, which was also called a 'fitch' (a fur-bearing animal).

Structure: fish (to catch fish) + er (one who does) fish (Old English, functional root meaning "fish" or "to fish"); er (Old English, agent noun suffix meaning "one who does or works with").