sealskin vs tegument

sealskin

noun
  • A type of fabric made from the skin of seals. 

  • An item of clothing made from sealskin (whether real or imitation). 

  • Any fabric manufactured to resemble sealskin. 

tegument

noun
  • Something which covers; a covering or coating. 

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