scurf vs spall

scurf

noun
  • Any crust-like formations on the skin, or in general. 

  • Minute membranous scales on the surface of some leaves, as in the goosefoot. 

  • A grey bull trout (Salvelinus confluentus). 

  • The foul remains of anything adherent. 

  • A skin disease. 

  • The flakes of skin that fall off as a result of a skin disease. 

spall

noun
  • A splinter, fragment or chip, especially of stone. 

verb
  • To break into fragments or small pieces. 

  • To reduce, as irregular blocks of stone, to an approximately level surface by hammering. 

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