1 syllable:
aunt's, aunts, aunts', clonts, clontz, daunts, donts, flaunts, fonts, frontz, guantes, haunts, hontz, jaunts, klontz, krontz, monts, montz, pont's, ponts, quants, rantes, schwantes, shontz, shrontz, taunts, vaunts, wants, wantz, yonts, yontz

2 syllables:
archonts, avants, belmonts, bouffants, croissants, enfants, grandaunts, larchmont's, myfonts, newmont's, piedmont's, piedmonts, restaurant's, restaurants, restaurants', storefronts, vermont's, vipont's

3 syllables:
arcs-boutants, bunodonts, commandants, conodonts, creodonts, debutantes, debutants, denouements, dilettantes, erbamont's, google fonts, predikants, rapprochements, volitantes

5 syllables:
endosymbionts, etablissements, labyrinthodonts

7 syllables:
sainte-agathe-des-monts

1 syllable:
hans, nonce, ponce, sconce

2 syllables:
vileness, ensconce, response

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, learned response, nonchalance, renaissance

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, immune response, impuissance, startle response

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

6 syllables:
angle of incidence, australopithecus, conditioned stimulus, conditional response

7 syllables:
humoral immune response

8 syllables:
conditioned avoidance response

9 syllables:
conditioned emotional response