2 Syllables: SU
ablest, aimless, alias, amos, anus, aqueous, atheist, baseless, baseness, bases, basest, basis, blameless, braces, bravest, caius, cases, cato, changes, chases, credo, davis, drainage, faces, faintest, faintness, famous, favorites, gauges, gazes, graceless, gracious, greatest, greatness, halo, heinous, janus, laces, lameness, lateness, latest, maketh, mayo, nameless, pages, painless, paleness, phases, phrases, places, plainest, plaintiff, plato, plato's, races, radius, rainbow, raises, ranges, safest, sameness, scapegoat, shameless, shapeless, spaces, spacious, stainless, status, strangeness, taketh, tasteless, traces, vases, wages, waistcoats, waitress, weymouth, zeno
3 Syllables: USU
andreas, audacious, barbadoes, capacious, contagious, courageous, cutaneous, diego, exchanges, extraneous, fallacious, hiatus, horatio, ignatius, loquacious, octavo, outrageous, potato, potatoes, sagacious, spontaneous, tenacious, tomato, tomatoes, tornado, ungracious, vexatious, vivacious, volcano, volcanoes, voracious
4 Syllables: UUSU
advantageous, athanasius, efficacious, galileo, himalayas, instantaneous, miscellaneous, ostentatious, simultaneous, subcutaneous, subterraneous
5 Syllables: UUSUU
5 Syllables: UUUSU
Found 125 words across 5 groupings. Skipped 2 excess words of a similar stem.