sac vs wheal

sac

noun
  • A sacrifice. 

  • A bag or pouch inside a plant or animal that typically contains a fluid. 

  • The privilege, formerly enjoyed by the lord of a manor, of holding courts, trying causes, and imposing fines; now used only in the phrase sac and soc or soc and sac. 

verb
  • To sacrifice. 

wheal

noun
  • A mine. 

  • A small raised swelling on the skin, often itchy, caused by a blow from a whip or an insect bite etc. 

verb
  • Synonym of wale. 

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