bitter pill vs nuisance

bitter pill

noun
  • Used other than figuratively or idiomatically: see bitter, pill. 

nuisance

noun
  • A minor annoyance or inconvenience. 

  • Anything harmful or offensive to the community or to a member of it, for which a legal remedy exists. 

  • A person or thing causing annoyance or inconvenience. 

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