accumulate vs cumulate

accumulate

adj
  • Collected; accumulated. 

verb
  • To gradually grow or increase in quantity or number. 

  • To heap up in a mass; to pile up; to collect or bring together (either literally or figuratively) 

cumulate

adj
  • accumulated, agglomerated, amassed 

verb
  • To accumulate; to amass. 

  • To be accumulated. 

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

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