lustrate vs refine

lustrate

verb
  • To make clear or pure by means of a propitiatory offering; to purify. 

refine

verb
  • To purify; reduce to a fine, unmixed, or pure state; to free from impurities. 

  • To improve in accuracy, delicacy, or excellence. 

  • To become pure; to be cleared of impure matter. 

  • To purify of coarseness, vulgarity, inelegance, etc.; to polish. 

  • To make nice or subtle. 

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