Or search: tip, acme, brow, peak, crest, attain, tiptop, meridian, pinnacle, elevation, superlative
2 Syllables: SU
blunted, Brunswick, bucket, budget, couplet, doublet, druggist, flourish, fronted, funded, grunted, hundred, hunted, justice, luscious, nourish, public, publick, public's, publish, punish, puppet, rubbish, russet, rustic, sluggish, stunted, suffix, summit, sunlit, Sussex, uplift
3 Syllables: USU
100, affronted, confronted, injustice, refunded, Republic, republished, unpublished, unpunished

Found 41 words across 2 groupings. Skipped 8 excess words of a similar stem.