Webster's English Dictionary

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spotter

spot.ter \'spa:t-*r\ n 1: one that makes or applies a spot (as for 
   identification)  2: one that looks or keeps watch : as  2a: one that 
   locates enemy targets  2b: a civilian who watches for approaching airplanes 
    3: one that removes spots  4: one that places something on or in a desired 
   spot