ewe vs lambskin

ewe

noun
  • A female sheep, as opposed to a ram. 

lambskin

noun
  • The skin of a very young sheep, especially prepared with the fleece still attached. A very fine form of leather. 

  • A kind of woollen cloth resembling this. 

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