mistresses

/M IH1 S T R AH0 S AH0 Z/
noun
  1. 1

    A woman, specifically one with great control, authority or ownership

    (male equivalent) master

  2. 2

    A female teacher

    (male equivalent) master

  3. 3

    The other woman in an extramarital relationship, generally including sexual relations

  4. 4

    A dominatrix

    (male equivalent) master

  5. 5

    A woman well skilled in anything, or having the mastery over it

  6. 6

    A woman regarded with love and devotion; a sweetheart

  7. 7

    A married woman; a wife

  8. 8

    The jack in the game of bowls

  9. 9

    A female companion to a master (a man with control, authority or ownership)

Source: https://en.wiktionary.org/wiki/mistress, https://en.wiktionary.org/wiki/mistresses