flail vs nagaika

flail

noun
  • A weapon which has the (usually spherical) striking part attached to the handle with a flexible joint such as a chain. 

  • A tool used for threshing, consisting of a long handle with a shorter stick attached with a short piece of chain, thong or similar material. 

verb
  • To beat using a flail or similar implement. 

  • To wave or swing vigorously 

  • To thresh. 

  • To move like a flail. 

nagaika

noun
  • A short, thick braided whip with a round cross-section, used by the Cossacks. 

How often have the words flail and nagaika occurred in a corpus of books? (source: Google Ngram Viewer )