ridge vs tump

ridge

verb
  • To form into a ridge 

  • To extend in ridges 

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. 

tump

verb
  • To form a mass of earth or a hillock around. 

  • To fall over. 

  • To draw or drag, as a deer or other animal after it has been killed. 

  • to bump, knock (usually used with "over", possibly a combination of "tip" and "dump") 

noun
  • A tumpline. 

  • A mound or hillock. 

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