Rudest rhymes with:
shrewdest, buddhist, shrewdest, blondest, buddhist, coldest, eldest, encyclopedist, fondest, grandest, hardest, kindest, loudest, methodist, mildest, modest, oddest, oldest, orthopedist, prejudiced, propagandist, proudest, saddest, sadist, shrewdest, soundest, stupidest, weirdest, widest
Rudest sounds like:
ratchet, ratcheted, readjust, readjusted, reattached, redact, redacted, redcoat, reddest, rededicate, reduced, reeducate, retest, retested, rethought, ridged, ridgewood, ritziest, roadside