plateau vs regulate

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. 

regulate

verb
  • To adjust (a mechanism) for accurate and proper functioning. 

  • To control or direct according to rule, principle, or law. 

  • To put or maintain in order. 

  • To adjust to a particular specification or requirement: regulate temperature. 

  • To dictate policy. 

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