accumulate vs assemble

accumulate

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

  • To gradually grow or increase in quantity or number. 

adj
  • Collected; accumulated. 

assemble

verb
  • To put together. 

  • To translate from assembly language to machine code. 

  • To gather as a group. 

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