semblance vs smokescreen

semblance

noun
  • the way something looks; appearance; form 

  • likeness, similarity; the quality of being similar. 

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 semblance and smokescreen occurred in a corpus of books? (source: Google Ngram Viewer )