rand vs ridge

rand

noun
  • A rocky slope, especially the area over a river valley; specifically, the Rand 

  • A random number. 

  • A single rod woven in and out of the stakes. 

  • A strip of leather used to fit the heels of a shoe. 

  • A border, edge or rim. 

  • The currency of South Africa, divided into 100 cents. 

ridge

noun
  • A chain of hills. 

  • A chain of mountains. 

  • The back of any animal; especially the upper or projecting part of the back of a quadruped. 

  • Any extended protuberance; a projecting line or strip. 

  • The line along which two sloping surfaces meet which diverge towards the ground. 

  • A long narrow elevation on an ocean bottom. 

  • The highest portion of the glacis proceeding from the salient angle of the covered way. 

  • An elongated region of high atmospheric pressure. 

  • The highest point on a roof, represented by a horizontal line where two roof areas intersect, running the length of the area. 

verb
  • To form into a ridge 

  • To extend in ridges 

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