modus operandi vs system

modus operandi

noun
  • A person or thing's normal mode of operation. 

  • A known criminal's established habits and mode of work when committing specific offences, especially fraud, matched with characteristics of an unsolved crime to narrow down (limit to a specific list) or profile suspects. 

system

noun
  • A set of body organs having a particular function. 

  • A set of equations involving the same variables, which are to be solved simultaneously. 

  • A set of alters, or the multiple (“the individual with multiple personalities due to, for example, a dissociative personality disorder”) who contains them. 

  • Preceded by the word the: the mainstream culture, controlled by the elites or government of a state, or a combination of them, seen as oppressive to the individual. 

  • A set of staves linked by a brace that indicate instruments or sounds that are to be played simultaneously. 

  • A collection of organized things; a whole composed of relationships among its members. 

  • A planetary system; a set of planets orbiting a star or star system 

  • A set of rules for a tabletop roleplaying game. 

  • A comprehensive and logically organized set of propositions or philosophical beliefs. 

  • A method or way of organizing or planning. 

  • A set of hardware and software operating in a computer. 

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