intermix vs intersperse

intermix

verb
  • To mix together; to intermingle or blend. 

noun
  • An intermixture; the product of mixing together 

intersperse

verb
  • To mix two things irregularly, placing things of one kind among things of other. 

  • To diversify by placing or inserting other things among something. 

  • To scatter or insert something into or among other things. 

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