accrue vs cumulate

accrue

verb
  • To accumulate. 

  • To become an enforceable and permanent right. 

  • To increase, to rise 

  • To reach or come to by way of increase; to arise or spring up because of growth or result, especially as the produce of money lent. 

  • To be incurred as a result of the passage of time. 

cumulate

verb
  • To be accumulated. 

  • To accumulate; to amass. 

adj
  • accumulated, agglomerated, amassed 

noun
  • An igneous rock formed by the accumulation of crystals from a magma either by settling or floating. 

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