interlock vs unite

interlock

verb
  • To fit or clasp together securely. 

  • To interlace. 

noun
  • A safety device that prevents activation in unsafe conditions. 

unite

verb
  • To bring together as one. 

  • To come together as one. 

noun
  • A British gold coin worth 20 shillings, first produced during the reign of King James I, and bearing a legend indicating the king's intention of uniting the kingdoms of England and Scotland. 

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