crasis vs temperament

crasis

noun
  • External vowel sandhi; contraction of a vowel or diphthong at the end of a word with a vowel or diphthong at the start of the following word. 

  • A mixture or combination. 

temperament

noun
  • Individual differences in behavior that are biologically based and are relatively independent of learning, system of values and attitudes. 

  • A person's usual manner of thinking, behaving or reacting. 

  • A tendency to become irritable or angry. 

  • The altering of certain intervals from their correct values in order to improve the moving from key to key. 

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