hexad vs six

hexad

noun
  • A group of six. 

  • An element or radical with the combining power of six units, i.e. six atoms of hydrogen. 

six

noun
  • A group or set with six elements. 

  • Rear, behind (rear side of something). 

  • The digit or figure 6. 

  • A touchdown. 

  • An event whereby a batsman hits a ball which does not bounce before passing over a boundary in the air, resulting in an award of 6 runs for the batting team. 

num
  • A numerical value equal to 6; the number following five and preceding seven. This many dots: (••••••). 

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