consolidate vs subsume

consolidate

verb
  • To combine into a single unit; to group together or join. 

  • To make stronger or more solid. 

  • With respect to debt, to pay off several debts with a single loan. 

subsume

verb
  • To place (any one cognition) under another as belonging to it; to include or contain something else. 

  • To consider an occurrence as part of a principle or rule; to colligate 

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