2 syllables:
centas, lentous, lentus, lent us, mentis, pentas, pentice, prentice, prentis, prentiss, sent us, ventouse, ventus, yentas

3 syllables:
adventice, adventists, adventus, appentice, apprentice, argentous, aventis, concentus, jumentous, magentas, momentous, ostentous, parentis, placentas, portentous, prevent us, proventus, sarmentous, tomentous, tricentis, unguentous, zaphrentis

4 syllables:
atramentous, compos-mentis, devincentis, filamentous, immomentous, ligamentous, pedetentous, velamentous

5 syllables:
medicamentous

6 syllables:
intraligamentous

2 syllables:
vileness

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, horrendous, stupendous, tremendous

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

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

6 syllables:
angle of incidence, australopithecus, conditioned stimulus