fantasticize vs make believe

fantasticize

verb
  • To make fantastic; to use the imagination to embellish. 

  • Synonym of fantasize 

make believe

verb
  • To pretend or imagine. 

noun
  • The act of pretending that what is imaginary is real. 

adj
  • imaginary; conjured in someone's imagination, especially when imagined by a child 

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