incline vs tump

incline

verb
  • To slope. 

  • To bend or move (something) out of a given plane or direction, often the horizontal or vertical. 

  • To tend to do or believe something, or move or be moved in a certain direction, away from a point of view, attitude, etc. 

noun
  • A portal of a subway tunnel. 

  • A slope. 

tump

verb
  • To fall over. 

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

  • 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 incline and tump occurred in a corpus of books? (source: Google Ngram Viewer )