overwhelm vs swallow up

overwhelm

verb
  • To overpower emotionally. 

  • To cause to surround, to cover. 

  • To engulf, surge over and submerge. 

  • To overpower, crush. 

noun
  • The state or condition of being overwhelmed. 

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 overwhelm and swallow up occurred in a corpus of books? (source: Google Ngram Viewer )