subsume vs swallow up

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 

swallow up

verb
  • To take over or absorb something (especially an organisation) so it no longer has a separate identity; to assimilate. 

  • To completely enclose or envelop. 

  • To voraciously consume resources, such as money; to devour. 

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