collocate vs correlate

collocate

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

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

  • To arrange or occur side by side. 

correlate

noun
  • Either of a pair of things related by a correlation; a correlative. 

verb
  • To compare things and bring them into a relation having corresponding characteristics. 

  • To be related by a correlation; to be correlated. 

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