knock together vs manufacture

knock together

verb
  • To assemble something quickly; to knock up. 

manufacture

verb
  • To make things, usually on a large scale, with tools and either physical labor or machinery. 

  • To fabricate; to create false evidence to support a point. 

  • To work (raw or partly wrought materials) into suitable forms for use. 

noun
  • The process of such production; generation, creation. 

  • The action or process of making goods systematically or on a large scale. 

  • A watch manufacturer that makes its own parts, rather than assembling watches from parts obtained from other firms. 

  • Anything made, formed or produced; product. 

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