ascent vs downgrade

ascent

noun
  • The degree of elevation of an object, or the angle it makes with a horizontal line; inclination; gradient; steepness 

  • The act of ascending; a motion upwards. 

  • An increase, for example in popularity or hierarchy 

  • The ascender height in a typeface. 

  • The way or means by which one ascends. 

  • An eminence, hill, or high place. 

downgrade

noun
  • A downhill gradient on a road or railway. 

  • A reduction of a rating, as a financial or credit rating. 

verb
  • to reduce the official estimate of a storm's intensity. 

  • To reduce in complexity, or remove unnecessary parts; to dumb down. 

  • To place lower in position. 

  • To revert software back to an older version. 

  • To disparage. 

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