Synonyms of mistress in English:

mistress


See US English definition of mistress

See UK English definition of mistress

See Spanish definition of señora

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