mix-up vs quandary

mix-up

noun
  • A confusion, mistake, muddle or misunderstanding 

quandary

noun
  • A dilemma, a difficult decision or choice. 

  • A state of not knowing what to decide; a state of difficulty or perplexity; a state of uncertainty, hesitation or puzzlement. 

How often have the words mix-up and quandary occurred in a corpus of books? (source: Google Ngram Viewer )