2 Syllables: SU
bogus, boldness, bonus, closest, coldest, copious, dosage, doses, focus, focussed, grossness, Grotius, homeless, hopeless, hostess, Jonas, Josef, Joseph, Joseph's, knowest, locus, locust, Lois, lotus, lowest, lowness, modus, Moses, Noah's, notice, odious, oldest, onus, opus, poses, postage, Proteus, quotas, slowest, slowness, sofas, soulless, voltage
3 Syllables: USU
atrocious, commodious, diplomas, erroneous, ferocious, harmonious, melodious, necrosis, neurosis, precocious, prognosis, psychosis, remoteness, remotest, Theodosius
4 Syllables: UUSU
5 Syllables: UUUSU
Found 64 words across 4 groupings. Skipped 2 excess words of a similar stem.