determine vs mull

determine

verb
  • To resolve (to do something); to establish a fixed intention; to cause (something) to come to a conclusion or decision; to lead. 

  • To fix the form or character of; to shape; to prescribe imperatively; to regulate; to settle. 

  • To fix the course of; to impel and direct; with a remoter object preceded by to. 

  • To bring to a conclusion, as a question or controversy; to settle authoritative or judicial sentence; to decide. 

  • To set the boundaries or limits of. 

  • To define or limit by adding a differentia. 

  • To bring to an end; to finish. 

  • To ascertain definitely; to figure out, find out, or conclude by analyzing, calculating, or investigating. 

mull

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

  • 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 join two or more individual windows at mullions. 

noun
  • 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 promontory. 

  • 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. 

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