chrism vs chrisom

chrism

noun
  • A mixture of oil and balm, consecrated for use as an anointing fluid in certain Christian ceremonies, especially confirmation. 

chrisom

noun
  • A white cloth, anointed with chrism, or a white mantle thrown over a child when baptized or christened. 

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