chador vs mantilla

chador

noun
  • A loose robe, made from a single cloth, worn as a combination head covering, veil and shawl by Muslim women, especially in Iran. 

mantilla

noun
  • A lace veil of Spanish origin worn over a woman's hair and shoulders. 

  • A woman's light cloak or cape made of silk, velvet, lace, or other material. 

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