Allotrope rhymes with:
heliotrope, heliotrope, isentrope, tightrope, heliotrope, isentrope, misanthrope, tightrope, antelope, cantaloupe, envelope, epitope, gastroscope, gyroscope, heliotrope, horoscope, interscope, isentrope, isotope, kaleidoscope, marketscope, microscope, misanthrope, ophthalmoscope, oscilloscope, partenope, periscope, polariscope, softsoap, stethoscope, telescope, tightrope, worldscope