quadrilateral vs quadruple

quadrilateral

adj
  • Having four sides. 

noun
  • An area defended by four fortresses supporting each other. 

  • A polygon with four sides. 

quadruple

adj
  • Being four times as long, as big or as many of something. 

verb
  • To multiply by four. 

  • To increase by a factor of four. 

  • To provide four parallel running lines on a given stretch of railway. 

noun
  • A figure-skating jump with four revolutions in the air. 

  • Something that is four times the usual number, amount, size, etc. 

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