nerf vs pejoration

nerf

noun
  • The deterioration, weakening or worsening of a character, a weapon, a spell, etc. 

verb
  • To change a mechanic, an ability or a character in a video game in order to make a previously dominant strategy less viable or less effective. 

  • To arbitrarily limit or reduce the capability of. 

  • To bump lightly, whether accidentally or purposefully. 

pejoration

noun
  • The act or process of becoming worse; worsening or degeneration. 

  • The process by which a word acquires a more negative meaning over time. 

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