self-suggestion vs symbolization

self-suggestion

noun
  • Synonym of autosuggestion 

symbolization

noun
  • The unconscious mental representation of one thing by another. 

  • The act of symbolizing; the use of symbols to represent things, or the investing of things with a symbolic meaning. 

How often have the words self-suggestion and symbolization occurred in a corpus of books? (source: Google Ngram Viewer )