Spieth rhymes with:
goliath, ardath, barath, behemoth, bernath, bismuth, colbath, conrath, cravath, dartmouth, demuth, donath, elizabeth, fagoth, faircloth, falmouth, fellmeth, goliath, gopinath, griffith, gwyneth, harvath, heimsoth, judith, kamrath, keinath, kollath, konrath, kossuth, kroboth, kunath, mammoth, massoth, milbrath, monmouth, morath, niemuth, plymouth, porath, portsmouth, pursueth, sabbath, samoth, schneckloth, suddath, sudduth, taketh, thirtieth, trembath, twentieth, unrath, vollrath, walrath, warmoth, weymouth, wilmoth, zenith
Spieth sounds like:
sabat, sabato, sabaudia, sabbath, sabta, safdie, safety, sapped, saputo, saved, savitt, scaffidi, scafidi, scoffed, scooped, scuffed, seabed, seafood, seeped, sepeda, sept, septa, sffed, shabad, shaft, shafted, shaped, shaved, shibata, shift, shifted, shifty, shipped, shopped, shoptaw, shoved, showboat, sift, sifted, sipped, skipped, skipwith, sobbed, sobota, sobotta, sociopath, soffit, soft, softwood, souped, soviet, spada, spade, spady, spaeth, spaid, spat, spate, spath, spayd, spayde, sped, speed, speeded, speedway, speedy, speth, spewed, spied, spit, spite, spoofed, spot, spoto, spotted, spotty, spout, spouted, spud, subbed, subdue, subdued, svoboda, swapped, swept, swift, swiped, swoboda, swooped