Sextuplet rhymes with:
shiplett, templet, triplett, anklet, appellate, barlett, bartlett, billett, booklet, bramblett, bramlet, bramlett, bullitt, capitulate, catlett, charlet, chavalit, collet, collett, corlett, coslett, cramblit, curlett, drolet, ellett, emasculate, follett, gallet, gelett, gillet, gullett, hallet, hallett, hamblet, hamlett, haslett, hayslett, hazlett, hewlett, hoblit, hollett, howlett, hughlett, hulet, hulett, hullett, inviolate, islet, kellett, mallet, mallett, marlett, mellett, millett, mollet, mollett, mullett, murrelet, neblett, niblett, noblett, noblitt, nolet, odelet, ouellet, parlett, pellett, piglet, pollet, pollett, pollitt, prelate, randlett, rowlett, scarlett, shacklett, shifflet, shifflett, shiflet, shiflett, shiplett, starlit, sublett, templet, tillett, tollett, triplett, ultraviolet, violet, willet, willett, winslet, winslett
Sextuplet sounds like:
seatbelt, southfield, stability, stapled, stifled, stipulate, stipulated, suitability