coating vs derma

coating

noun
  • A thin outer layer. 

  • A telling-off; a reprimand. 

derma

noun
  • The inner layer of the skin. 

  • A Jewish dish of roast or boiled seasoned meat and flour etc. in a casing, especially kishke. 

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