subgroup

/S AH1 B G R UW0 P/
noun
  1. 1

    A group within a larger group; a group whose members are some, but not all, of the members of a larger group.

  2. 2

    A subset H of a group G that is itself a group and has the same binary operation as G.

Synonyms

verb
  1. 1

    To divide or classify into subgroups

Source: https://en.wiktionary.org/wiki/subgroup