mull vs slave

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. 

slave

verb
  • To work hard. 

  • To work as a slaver, to enslave people. 

  • To place a device under the control of another. 

noun
  • A sex slave, a person who is forced against their will to perform, for another person or group, sexual acts on a regular or continuing basis. 

  • An abject person. 

  • A submissive partner in a BDSM relationship who (consensually) submits to (sexually and/or personally) serving one or more masters or mistresses. 

  • A device (such as a secondary flash or hard drive) that is subject to the control of another (a master). 

  • A person who is held in servitude as the property of another person, and whose labor (and often also whose body and life) is subject to the owner's volition and control. 

  • A drudge; one who labors or is obliged (e.g. by prior contract) to labor like a slave with limited rights, e.g. an indentured servant. 

  • One who has no power of resistance (to something), one who surrenders to or is under the domination (of something). 

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