Proudest rhymes with:
loudest, blondest, buddhist, coldest, eldest, encyclopedist, fondest, grandest, hardest, kindest, loudest, methodist, mildest, modest, oddest, oldest, orthopedist, prejudiced, propagandist, rudest, saddest, sadist, shrewdest, soundest, stupidest, weirdest, widest
Proudest sounds like:
parodist, predicate, predicated, predict, predicted, pretext, prettiest, prioritized, pritchett, produced, product, protect, protected, protectee, protest, protested