regrade vs reproduce

regrade

verb
  • To regroup or reassign. 

  • To change the classification of (potentially secret documentation). 

  • To grade again, give a new grade or grading to. 

noun
  • The act or process of grading again. 

reproduce

verb
  • To produce again; to recreate. 

  • To generate or propagate offspring or organisms sexually or asexually. 

  • To bring something to mind; to recall. 

  • To produce an image or copy of. 

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