crasis vs trait

crasis

noun
  • A mixture or combination. 

  • 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. 

trait

noun
  • An identifying characteristic, habit or trend. 

  • An uninstantiable collection of methods that provides functionality to a class by using the class’s own interface. 

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