anyone's guess vs embarrassment

anyone's guess

noun
  • A mystery; something unpredictable. 

embarrassment

noun
  • A state of confusion; hesitation; uncertainty 

  • A state of discomfort arising from bashfulness or consciousness of having violated a social rule; humiliation. 

  • Impairment of function due to disease: respiratory embarrassment. 

  • A large collection of good or valuable things, especially one that exceeds requirements. 

  • A person or thing which is the cause of humiliation to another. 

How often have the words anyone's guess and embarrassment occurred in a corpus of books? (source: Google Ngram Viewer )