Khartoum rhymes with:
costume, entomb, maktoum, tomb, abloom, assume, bloom, blum, blume, boom, broom, broome, consume, costume, croom, crume, deblum, doom, entomb, exhume, flume, fume, gloom, groom, groome, hume, kaboom, kume, laplume, legroom, loom, maktoum, mcbroom, perfume, plume, presume, reassume, reaume, resume, rheaume, room, roome, suhm, tomb, vroom, whom, womb, zoom
Khartoum sounds like:
keratin, keratotomy, kirton, koreatown, korten, kortman, kortum, kreitman, krudman