mull vs scum

mull

noun
  • A promontory. 

  • An inferior kind of madder prepared from the smaller roots or the peelings and refuse of the larger. 

  • A stew of meat, broth, milk, butter, vegetables, and seasonings, thickened with soda crackers. 

  • dirt; rubbish 

  • A thin, soft muslin. 

  • A snuffbox made of the small end of a horn. 

  • The gauze used in bookbinding to adhere a text block to a book's cover. 

  • Marijuana that has been chopped to prepare it for smoking. 

verb
  • To chop marijuana so that it becomes a smokable form. 

  • To dull or stupefy. 

  • To powder; to pulverize. 

  • To heat and spice something, such as wine. 

  • To work (over) mentally; to cogitate; to ruminate. 

  • To join two or more individual windows at mullions. 

scum

noun
  • Semen. 

  • A layer of impurities that accumulates at the surface of a liquid (especially molten metal or water). 

  • A greenish water vegetation (such as algae), usually found floating on the surface of ponds 

  • A reprehensible person or persons. 

  • The topmost liquid layer of a cesspool or septic tank. 

verb
  • To remove (something) as scum. 

  • To startscum or savescum. 

  • To remove the layer of scum from (a liquid etc.). 

  • To become covered with scum. 

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