Synonyms of mistress in English:

mistress


See definition of mistress

noun

1‘his wife never found out about his mistress’

SYNONYMS
lover, girlfriend, paramour, kept woman, live-in lover
courtesan, concubine, inamorata, hetaera, sultana
British informal girlf, bit on the side
British informal, dated fancy woman
dated lady-love
archaic doxy, leman