cloak vs smokescreen

cloak

noun
  • That which conceals; a disguise or pretext. 

  • A long outer garment worn over the shoulders covering the back; a cape, often with a hood. 

  • A blanket-like covering, often metaphorical. 

  • A text replacement for an IRC user's hostname or IP address, making the user less identifiable. 

verb
  • To cover up, hide or conceal. 

  • To render or become invisible via futuristic technology. 

  • To cover as with a cloak. 

smokescreen

noun
  • Anything used metaphorically to conceal or distract. 

  • Smoke used as a disguise, mask or cover, as of troops in battle. 

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