dismantle vs knock together

dismantle

verb
  • To divest, strip of dress or covering. 

  • To take apart; to disassemble; to take to pieces. 

  • To remove fittings or furnishings from. 

knock together

verb
  • To assemble something quickly; to knock up. 

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