3 syllables:
element, tellement

4 syllables:
trace element, transelement

5 syllables:
actuellement, cointet-element, essentiellement, logic element, naturellement, picture element, rare-earth element, thermoelement, threshold element

6 syllables:
accidentellement, chemical element, classical element, metallic element

7 syllables:
identity element

3 syllables:
linocut, insulant, distillate, immanent, infinite, sibilant, littlest, stimulant, defilement, imminent, instillment, militant, innocent, indolent, ligament, visitant, dissonant, implement, liquescent, immigrant, instrument, intricate, difficult, silicate, filament, impotent, diffident, discrepant, increment, incident, insolent, scintillant, vigilant, intimate, simulate, celebrant, decadent, deficit, definite, delegate, delicate, desiccant, desolate, detriment, elegant, elephant, eloquent, emigrant, eminent, estimate, etiquette, evident, excellent, excrement, exquisite, feculent, federalist, geminate, heaven-sent, methodist, negligent, pediment, pessimist, pestilent, petulant, prejudiced, prevalent, redolent, regiment, registrant, relevant, requisite, resonant, secondment, sediment, sentiment, settlement, specialist, tegument, temperament, tenement, testament, vellicate

4 syllables:
precipitant, grandiloquent, verticillate, legitimate, acidulent, coincident, predicament, imprisonment, participant, articulate, debt instrument, sophisticate, magnificent, munificent, anticipant, fluosilicate, particulate, ambivalent, omnipotent, stringed instrument, wind instrument, equivalent, affectionate, anesthetist, antecedent, areca nut, bedevilment, benevolent, connecticut, development, ear specialist, embezzlement, envelopment, expressionist, geneticist, heart specialist, impediment, impressionist, indefinite, inelegant, integument, intelligent, irrelevant, malevolent, new testament, nonresident, nonresonant, old testament, perfectionist, predestinate, preeminent, prerequisite, presentiment, resettlement, rogue elephant, sea elephant, self-evident, trade deficit, unprejudiced, white elephant

5 syllables:
transit instrument, hereditament, borosilicate, unearned increment, individuate, abolitionist, indiscriminate, inarticulate, false imprisonment, budget deficit, frontier settlement, land development, marriage settlement, nondevelopment, redevelopment, underestimate, unintelligent

6 syllables:
sodium silicate, musical instrument, percussion instrument, african elephant, federal deficit, fingerprint specialist, housing development, indian elephant, medical specialist, property settlement, ribbon development, underdevelopment, water development

7 syllables:
negotiable instrument, scientific instrument, common stock equivalent, alluvial sediment, arrested development, imperial elephant, viatical settlement

8 syllables:
capital of connecticut

9 syllables:
housing and urban development

13 syllables:
department of housing and urban development

14 syllables:
secretary of housing and urban development

16 syllables:
international bank for reconstruction and development