acclivity vs hump

acclivity

noun
  • A slope or inclination of the earth, as the side of a hill, considered as ascending, in opposition to declivity, or descending; an upward slope; ascent. 

hump

noun
  • A mound of earth. 

  • An act of sexual intercourse. 

  • A bad mood. 

  • A speed bump or speed hump. 

  • A wave that forms in front of an operating hovercraft and impedes progress at low speeds. 

  • A rounded fleshy mass, such as on a camel or zebu. 

  • A painfully boorish person. 

  • A deformity in humans caused by abnormal curvature of the upper spine. 

verb
  • To carry (something), especially with some exertion. 

  • To bend something into a hump. 

  • To shunt wagons / freight cars over the hump in a hump yard. 

  • To dry-hump. 

  • To have sex (with). 

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