Synonyms for Mistress:

n.

manager, matron, cat litter, kitty litter, consort, lady, mother, caretaker, handler, wife, call off, domesticate, exercise, kennel, heel, housekeeper, answer to, litter. chieftain, dictator, sweetheart, ladylove, boss, the Establishment, courtesan, enforcer, chief, paramour, autocrat, voluptuary, figurehead, concubine, demagogue, employer. ho, moll, someone's girl, inamorata, girlfriend. harlot (noun)
concubine.
ladylove (noun)
fancy woman, girlfriend, sweetheart, concubine, moll, inamorata, kept woman, ladylove, courtesan, paramour.
lover (noun)
inamorata, paramour.
mistress (noun)
kept woman, schoolmarm, fancy woman, schoolmistress.
paramour (noun)
girlfriend, kept woman.
servants (noun)
cabin boy, footman, houseboy, amah, housemaid, girl, handmaiden, help, butler, domestic service.
titles (noun)
honorific, jr., esq, Her/Your Ladyship, HON, judge, the Honorable, dame, justice.
woman (noun)
lady.

Other synonyms:

moll. girlfriend. ho. concubine
paramour.
harlot
concubine.
mistress
courtesan.
paramour
inamorata.
Other relevant words:
dame, employer, ladylove, ho, sweetheart, caretaker, girlfriend, mother, girl, housekeeper, lady, paramour, concubine, matron, voluptuary, courtesan, chief, inamorata, wife, moll.

Usage examples for mistress

  1. My wife is so pleased that you and the mistress are coming! – The Woman of Mystery by Maurice Leblanc
  2. Wouldn't you do it to serve my mistress – Blind Love by Wilkie Collins
  3. If you please, gentlemen, the doctor wants you to come and see mistress – The Green Mummy by Fergus Hume