Sweetest rhymes with:
neatest, advantest, anabaptist, anesthetist, apprenticed, artist, baptist, bluntest, brightest, cornettist, cultist, dentist, faintest, fastest, fattest, fittest, greatest, hottest, lastest, latest, librettist, lightest, neatest, noticed, orthodontist, practiced, quietest, quietist, remotest, slightest, smartest, softest, strictest, swiftest, tightest, wettest
Sweetest sounds like:
saddest, sadist, sawdust, scotched, seduced, sketched, southeast, southgate, southside, southstate, southwest, staccato, stacked, staged, stake-out, staked, stakeout, stashed, stateside, stateswest, statist, steketee, sticht, stickiest, stitched, stocked, stockett, stoked, stuccoed, swatched, sweatsuit, switched