mar vs plateau

mar

verb
  • To spoil; to ruin; to scathe; to damage. 

noun
  • A small lake. 

  • A blemish. 

plateau

verb
  • (of a varying quantity) To reach a stable level after a period of increase; to level off. 

noun
  • A comparatively stable level after a period of increase. 

  • A notable level of attainment or achievement. 

  • A largely level expanse of land at a high elevation; tableland. 

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