2 Syllables: SU
ablest, aimless, alias, Amos, anus, aqueous, atheist, baseless, baseness, bases, basest, basis, blameless, braces, bravest, Buenos, Caius, cases, changes, chases, Davis, drainage, faces, faintness, famous, gauges, gazes, graceless, gracious, greatest, greatness, heinous, Janus, laces, lameness, lateness, latest, maketh, nameless, pages, painless, paleness, phases, phrases, places, plainest, plaintiff, races, radius, raises, ranges, safest, sameness, shameless, shapeless, spaces, spacious, stainless, status, strangeness, taketh, tasteless, traces, vases, wages, Weymouth
3 Syllables: USU
Andreas, audacious, capacious, contagious, courageous, cutaneous, exchanges, extraneous, fallacious, hiatus, Ignatius, loquacious, outrageous, sagacious, spontaneous, tenacious, ungracious, vexatious, vivacious, voracious
4 Syllables: UUSU
advantageous, Athanasius, efficacious, Himalayas, instantaneous, miscellaneous, ostentatious, simultaneous, subcutaneous, subterraneous
5 Syllables: UUUSU
Found 100 words across 4 groupings. Skipped 1 excess word of a similar stem.