Hyacinthe rhymes with:
absinthe, jacinth, jacinthe, absinthe, helminth, jacinth, jacinthe, absinthe, amaranth, billionth, coelacanth, corinth, cynth, drenth, dushyanth, eighteenth, eleventh, eranthe, fifteenth, fourteenth, helminth, hyacinth, jacinth, jacinthe, labyrinth, millionth, month, nineteenth, ninth, nth, plinth, rhodanthe, seventeenth, seventh, sixteenth, tenth, thirteenth, threemonth, umpteenth
Hyacinthe sounds like:
hacienda, hackneyed, hashemite, hashimoto, hasn't, highsmith, hignite, hochmuth, hoshimoto, housand, huguenot, hyacinth, hyacintha, hyacinthia, hyacinthie