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