interlacing vs tracery

interlacing

noun
  • The pattern or motion of something that interlaces. 

tracery

noun
  • A delicate interlacing of lines reminiscent of the architectural ornament. 

  • Bars or ribs, usually of stone or wood, or other material, that subdivide an opening or stand in relief against a door or wall as an ornamental feature. 

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