accumulate vs collocate

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. 

collocate

verb
  • To arrange or occur side by side. 

  • (said of certain words) To be often used together, form a collocation; for example strong collocates with tea. 

noun
  • A component word of a collocation; a word that collocates with another. 

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