Heliotrope rhymes with:
allotrope, allotrope, isentrope, tightrope, allotrope, isentrope, misanthrope, tightrope, allotrope, antelope, cantaloupe, envelope, epitope, gastroscope, gyroscope, horoscope, interscope, isentrope, isotope, kaleidoscope, marketscope, microscope, misanthrope, ophthalmoscope, oscilloscope, partenope, periscope, polariscope, softsoap, stethoscope, telescope, tightrope, worldscope
Heliotrope sounds like:
hoelterhoff, holderby, holdorf, holtorf, holtrop