group vs mob

group

verb
  • To come together to form a group. 

  • To put together to form a group. 

noun
  • A column in the periodic table of chemical elements. 

  • An element of an espresso machine from which hot water pours into the portafilter. 

  • A (usually small) group of people who perform music together. 

  • An air force formation. 

  • A number of users with the same rights with respect to accession, modification, and execution of files, computers and peripherals. 

  • A number of things or persons being in some relation to one another. 

  • A subset of a culture or of a society. 

  • A functional group. 

  • A small number (up to about fifty) of galaxies that are near each other. 

  • A collection of formations or rock strata. 

  • A number of eighth, sixteenth, etc., notes joined at the stems; sometimes rather indefinitely applied to any ornament made up of a few short notes. 

  • A set with an associative binary operation, under which there exists an identity element, and such that each element has an inverse. 

  • A commercial organization. 

  • A set of teams playing each other in the same division, while not during the same period playing any teams that belong to other sets in the division. 

mob

verb
  • To crowd into or around a place. 

  • To wrap up in, or cover with, a cowl. 

  • To crowd around (someone), sometimes with hostility. 

noun
  • A mob cap. 

  • See also: Mob, Mafia (proper noun senses for specific ones) 

  • A group of animals such as horses or cattle. 

  • mobile phone 

  • See also: Mob (the masses) 

  • A large or disorderly group of people; especially one bent on riotous or destructive action. 

  • A group of kangaroos. 

  • A mafia: a group that engages in organized crime. 

  • A non-player character, especially one that exists to be fought or killed to further the progression of the story or game. 

  • A group of Aboriginal people associated with an extended family group, clan group or wider community group, from a particular place or country. 

  • A flock of emus. 

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