engobe vs pottery

engobe

noun
  • A clay slip which is colored with metal oxides or stains, used for coating the surface of a pot either before or after bisque firing. 

  • A non-black clay slip coating applied to a ceramic body to give it decorative color or improved texture. 

pottery

noun
  • Fired ceramic wares that contain clay when formed. 

  • The potter's craft or art: making vessels from clay. 

  • A potter's shop or workshop, where pottery is made. 

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