reassemble vs regroup

reassemble

verb
  • to assemble again 

  • to put back together; to reverse the process of disassembly 

regroup

verb
  • To pause and get organized again. 

  • To group or categorize again. 

noun
  • An act of regrouping. 

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