aversion vs bitterness

aversion

noun
  • An object of dislike or repugnance. 

  • Opposition or repugnance of mind; fixed dislike often without any conscious reasoning. 

bitterness

noun
  • The quality of eliciting a bitter, humiliating or harsh feeling. 

  • The quality of having a bitter taste. 

  • Harsh cold. 

  • The quality of feeling bitter; acrimony, resentment; the quality of exhibiting such feelings. 

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