Grapefruit rhymes with:
breadfruit, arrowroot, bitterroot, breadfruit, absolute, arrowroot, attribute, bandicoot, bitterroot, breadfruit, constitute, convolute, countersuit, crapshoot, destitute, electrocute, execute, institute, jumpsuit, lawsuit, malamute, offshoot, overshoot, pantsuit, parachute, persecute, prosecute, prostitute, reconstitute, resolute, restitute, spacesuit, substitute, sweatsuit, swimsuit, telecommute, wetsuit, wintermute
Grapefruit sounds like:
gerbert, grabert, graveyard, graybeard