2 syllables:
beat us, cetus, cletus, fetus, foetus, greet us, laetus, meatus, meet us, metus, thetis, treatise, treat us, wheatus

3 syllables:
akitas, boletus, caritas, carnitas, casitas, cbtis, circaetus, copetas, cricetus, gypaetus, komitas, lolitas, melitis, mellitus, milpitas, ouachitas, partitas, pepitas, rafetus, real betis, sabritas, servetus, sylhetis, vermetus

4 syllables:
amanitas, anacletus, anicetus, cellulitis, chiquititas, citrinitas, diabetus, divinitas, encinitas, eptatretus, graviditas, heracleitus, iapetus, mammillitis, margaritas, pakicetus, papillitis, paracletus, parochetus, polycletus, romanitas, tonsillitis

5 syllables:
adipositas, ambulocetus, cerebellitis, exocoetus, gastroboletus, haliaeetus, labyrinthitis, mesocricetus

6 syllables:
cystopyelitis

7 syllables:
dermatocellulitis, pharyngotonsillitis

8 syllables:
the case study of vanitas

2 syllables:
vileness, cebus, negus, phoebus, rebus

3 syllables:
impetus, sinfulness, impotence, blissfulness, willfulness, imminence, synchronous, pythoness, vigilance, innocence, winsomeness, fistulous, minuteness, wickedness, nicholas, ninepence, bibulous, singleness, nimbleness, listlessness, synthesis, littleness, insolence, diligence, fickleness, ricinus, syllabus, dissonance, dictamnus, incidence, stimulus, immanence, diclinous, diffidence, limitless, frivolous, mischievous, singultus, spitefulness, mindlessness, skillfulness, instruments, simpleness, vividness, villainous, alikeness, wistfulness, brittleness, limulus, infamous, amoebous, cacicus

4 syllables:
infiniteness, calyculus, vertiginous, polygamous, indigenous, meticulous, deliciousness, officiousness, ridiculous, religiousness, antithesis, precipitance, equivalence, saint nicholas, asynchronous, maliciousness, leviticus, capriciousness, cuniculus, bicephalous, omnipotence, pediculus, perniciousness, felicitous, ambivalence, acidulous, utriculus, iniquitous, propitiousness, suspiciousness, nonsynchronous, declivitous, funiculus, auspiciousness, ambitiousness, arctocebus, cercocebus, king oedipus, leontocebus, naemorhedus, nycticebus

5 syllables:
telekinesis, meretriciousness, indefiniteness, canaliculus, diakinesis, chemosynthesis, irreligiousness, inauspiciousness, geosynchronous, infelicitous, aspergillosis, unambiguous, erythrocebus

6 syllables:
angle of incidence, australopithecus, conditioned stimulus