regulate vs remain

regulate

verb
  • To put or maintain in order. 

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

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

  • To dictate policy. 

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

remain

verb
  • To continue unchanged in place, form, or condition, or undiminished in quantity; to abide; to stay; to endure; to last. 

  • To await; to be left to. 

  • To continue in a state of being. 

  • To be left after a number or quantity has been subtracted or cut off; to be left as not included or comprised. 

  • To stay after others or other parts have been removed or otherwise disappeared. 

noun
  • That which is left; relic; remainder. 

  • That which is left of a human being after the life is gone; relics; a dead body. 

  • Posthumous works or productions, especially literary works. 

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