2 syllables:
aescin, besson, betsson, bressan, bresson, caisson, cecin, chesson, ciesin, creson, cresson, decine, dessin, dressen, dress in, ehsan, escin, essen, esson, essonne, hessen, hesson, jessen, jesson, kessen, kesten, kressin, lesesne, lessen, lessin, lesson, less in, mesen, messan, messen, messene, messin, messin', mess in, pessin, pressen, presson, press in, stress in, szczecin, tessin, wessen, wesson, yesen

3 syllables:
aggressin, cavesson, clavecin, dance lesson, distress in, expressen, express in, fluorescin, french lesson, golf lesson, luc besson, mckesson, monesin, monessen, possess in, prinzessin, putrescin, recess in, smif-n-wessun, success in, taliessin, unless in, vergessen

4 syllables:
acquiesce in, argipressin, camptothecin, desmopressin, felypressin, german lesson, hebrew lesson, language lesson, music lesson, object lesson, ornipressin, tennis lesson, terlipressin, vasopressin

5 syllables:
cartier-bresson, delicatessen, delikatessen, history lesson, kristoffer klaesson, nevertheless in, piano lesson, violin lesson

2 syllables:
cession, deafen, devon, evan, freshen, heaven, hessian, leaven, question, resin, session, seven, stetson

3 syllables:
lebanon, telamon, denizen, feminine, estrogen, gentleman, benjamin, chevrotain, megaton, pelican, skeleton, bedouin, mexican, gelatin, edmonton, regimen, venison, evelyn, specimen, genuine, melanin, lecithin, medicine, accession, aggression, bull session, closed session, compression, concession, confession, depression, digression, discretion, egression, eleven, expression, gum resin, impression, jam session, obsession, oppression, phaethon, possession, precession, procession, profession, progression, rap session, recession, refreshen, regression, repression, secession, skull session, succession, suppression, transgression

4 syllables:
type specimen, space medicine, balletomane, adrenaline, deaccession, decompression, dispossession, great depression, health profession, indiscretion, intercession, learned profession, nonaggression, practice session, prepossession, repossession, retrogression, self-expression, self-possession, sense impression, seventh heaven, special session, supersession, tree of heaven, twenty-seven, vault of heaven, vinyl resin, wage concession

5 syllables:
biomedicine, exoskeleton, patent medicine, aeromedicine, acrylic resin, amino resin, cannabis resin, epoxy resin, facial expression, image compression, legal profession, line of succession, manic depression, manna from heaven, melamine resin, natural resin, phenolic resin, silicone resin, simple regression, synthetic resin, taking possession, transferred possession, without expression

6 syllables:
internal medicine, aerospace medicine, cedar of lebanon, acanthocephalan, preventive medicine, clinical depression, executive session, harmonic progression, immunosuppression, indirect expression, linear regression, medical profession, multiple regression, natural depression, neurotic depression, polyvinyl resin, psychotic depression, reactive depression, retarded depression, thermoplastic resin, thermosetting resin

7 syllables:
aviation medicine, alternative medicine, veterinary medicine, complementary medicine, agitated depression, arithmetic progression, economics profession, exogenous depression, exponential expression, geometric progression, material possession

8 syllables:
chronological succession, ecological succession, idiomatic expression, war of the spanish succession

9 syllables:
war of the austrian succession