Source : Webster's Revised Unabridged Dictionary (1913)

Finns \Finns\, n. pl.; sing. {Finn}. (Ethnol.)
   (a) Natives of Finland; Finlanders.
   (b) A branch of the Mongolian race, inhabiting Northern and
       Eastern Europe, including the Magyars, Bulgarians,
       Permians, Lapps, and Finlanders. [Written also {Fins}.]

Source : WordNet®

fins
     n : a shoe for swimming; the paddle-like front is an aid in
         swimming (especially underwater) [syn: {flipper}, {flippers},
          {fin}]