Helminth rhymes with:
absinthe, hyacinthe, jacinth, jacinthe, absinthe, amaranth, billionth, coelacanth, corinth, cynth, drenth, dushyanth, eighteenth, eleventh, eranthe, fifteenth, fourteenth, hyacinth, hyacinthe, jacinth, jacinthe, labyrinth, millionth, month, nineteenth, ninth, nth, plinth, rhodanthe, seventeenth, seventh, sixteenth, tenth, thirteenth, threemonth, umpteenth
Helminth sounds like:
haaland, hailand, halimeda, heiland, helland, hellmuth, helmet, helmeted, helmont, helmut, helmuth, hiland, hoiland, holland, howland, hoyland, hulond, hyland