Mistresses rhymes with:
headmistresses, seamstresses, buttresses, citrus's, headmistresses, mattresses, seamstresses, buttresses, citrus's, headmistresses, horace's, mattresses, maurice's, seamstresses, tauruses, terraces, viruses
Mistresses sounds like:
master's, masters, masters', masterwork, masterworks, mastrich, mastrich's, mcdaris, mckitrick, mckittrick, mcwaters, mcwatters, megastores, meisters, mesothorax, minister's, ministers, ministers', ministries, ministry's, minstar's, misters, mistress, mixtures, monasteries, monsters, monstrous, moonstruck, mostar's, musketeers, musters, mysteries, mysterious