Or search: fox, vex, pose, amaze, elude, stump, upset, baffle, bemuse, gravel, puzzle, riddle, fuddle, untune, bedevil
2 Syllables: SU
billiard, builder, filler, filter, Gilbert, Guilford, killer, Milford, Miller, Milner, pillar, Schiller, silver, tiller, Villiers, Wilbur, Willard
3 Syllables: USU
bewildered, familiar, quicksilver
4 Syllables: UUSU
unfamiliar

Found 21 words across 3 groupings. Skipped 9 excess words of a similar stem.