2 syllables:
-escence, crescence, escence, essence, les uns, plesance, pubescence

3 syllables:
abaisance, accrescence, acescence, albescence, bienfaisance, calescence, candescence, canescence, concrescence, decrescence, excrescence, fervescence, florescence, fluorescence, fremescence, frondescence, fructescence, frutescence, in essence, lactescence, latescence, liquescence, marcescence, nigrescence, pearlescence, petrescence, prepubescence, putrescence, quiescence, quintessence, rubescence, rufescence, senescence, spinescence, spumescence, tabescence, torpescence, tumescence, usance, virescence, vitrescence

4 syllables:
acquiescence, adolescence, adolesence, alkalescence, arborescence, cabinessence, calorescence, coalescence, consenescence, contabescence, convalescence, decalescence, decrudescence, defervescence, deliquescence, delitescence, detumescence, effervescence, efflorescence, emollescence, erubescence, evanescence, excandescence, extumescence, hyalescence, incalescence, incandescence, inflorescence, infructescence, ingravescence, insenescence, intumescence, invalescence, iridescence, juvenescence, lapidescence, luminescence, middlescence, oblivescence, obmutescence, obsolescence, of the essence, opalescence, phosphorescence, ramollescence, recalescence, recrudescence, reflorescence, revalescence, revirescence, supercrescence, synflorescence, vaporescence, viridescence, virilescence

5 syllables:
adularescence, autofluorescence, exacerbescence, incoalescence, ineffervescence, labradorescence, nonacquiescence, reconvalescence, rejuvenescence, superexcrescence

6 syllables:
bioluminescence, chemiluminescence, chemoluminescence, immunofluorescence, immunosenescence, photoluminescence, sonoluminescence, thermoluminescence, triboluminescence

7 syllables:
cathodoluminescence, electroluminescence, mechanoluminescence, radioluminescence

9 syllables:
electrochemiluminescence