2 syllables:
-escent, bessent, cessant, cr., crescent, escent, jessant, ouessant, pubescent

3 syllables:
accrescent, acescent, albescent, ascessant, calescent, candescent, canescent, caressant, caulescent, concrescent, confessant, decrescent, depressant, excrescent, fervescent, flavescent, florescent, flourescent, fluorescent, fremescent, frutescent, glabrescent, glaucescent, herbescent, ignescent, incessant, increscent, lactescent, languescent, latescent, lutescent, marcescent, mollescent, nigrescent, pallescent, papescent, pearlescent, petrescent, postpubescent, pre-pubescent, prepubescent, putrescent, quiescent, rancescent, rigescent, rubescent, rufescent, senescent, spinescent, spumescent, sugescent, suppressant, tabescent, torpescent, tumescent, uncessant, virescent, vitrescent

4 syllables:
acaulescent, acquiescent, adipescent, adolescent, adolesent, adultescent, alcalescent, alkalescent, almond crescent, arborescent, cerulescent, cinerescent, circumcrescent, coalescent, contabescent, convalescent, decadescent, decalescent, defervescent, deliquescent, delitescent, detumescent, effervescent, efflorescent, equicrescent, erubescent, evanescent, excandescent, gangrenescent, hyalescent, hypodescent, incalescent, incandescent, incanescent, inflorescent, ingravescent, interessant, intumescent, iridescent, juvenescent, lapidescent, luminescent, maturescent, obmutescent, obsolescent, opalescent, phosphorescent, recalescent, revalescent, revirescent, somnolescent, sonorescent, spinulescent, suffrutescent, supercrescent, violescent, viridescent

5 syllables:
adularescent, anti-depressant, antidepressant, antiputrescent, autofluorescent, inacquiescent, ineffervescent, noneffervescent, preadolescent, rejuvenescent

6 syllables:
bioluminescent, chemiluminescent, immunodepressant, immunofluorescent, immunosuppressant, photoluminescent, s.m.a.r.t, thermoluminescent, triboluminescent

7 syllables:
electroluminescent