regroup vs whet

regroup

verb
  • To pause and get organized again. 

  • To group or categorize again. 

noun
  • An act of regrouping. 

whet

verb
  • To stimulate or make more keen. 

  • To hone or rub on with some substance, as a piece of stone, for the purpose of sharpening – see whetstone. 

noun
  • The act of whetting something. 

  • That which whets or sharpens; especially, an appetizer. 

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