2 syllables:
boepple, copal, copel, go pill, kloeppel, koeppel, kopel, nopal, opal, opale, opel, ople, propyl, scopal, topal, topel

3 syllables:
black opal

4 syllables:
amphitropal, anatropal, andrinople, fire opal, isopropyl

5 syllables:
adrianople, batbygobstopl, constantinople, harlequin opal

2 syllables:
climbable, crotal, focal, global, local, mobile, modal, moghul, mogul, motile, noble, ogle, roble, snowbell, socle, total, vocal, vogul, yodel

3 syllables:
sinkable, cinquefoil, printable, risible, principal, synchronal, clinical, vincible, pitiful, pivotal, livable, criminal, tillable, imbecile, principle, liveable, syllable, integral, biblical, shrinkable, finagle, bimetal, minimal, mythical, binnacle, thinkable, visible, quizzical, mixable, digital, biddable, visual, drinkable, pinnacle, fixable, pinochle, bridgeable, miscible, trigonal, typical, fictional, victual, asphodel, bimodal, chernobyl, ennoble, ignoble, immobile, immotile, nonmotile, sum total

4 syllables:
unbridgeable, indictable, invisible, permissible, disenable, disyllable, pontifical, original, veridical, traditional, provisional, transmissible, forgivable, war criminal, admissible, despicable, immiscible, convincible, rescindable, assignable, equivocal, dividable, transmittable, predictable, germicidal, anticlinal, unsinkable, conditional, invincible, reciprocal, divisional, undrinkable, univocal, divisible, hospitable, unprintable, meningocele, juridical, miserable, medicinal, episcopal, nutritional, disciplinal, explicable, formidable, admittable, antipodal, additional, unthinkable, resistible, political, municipal, extricable, unlivable, transitional, dissyllable, anecdotal, paso doble, sacerdotal, unimodal

5 syllables:
eosinophil, unpredictable, paralytical, polysyllable, reconcilable, appositional, unforgivable, inhospitable, apparitional, irresistible, inadmissible, unequivocal, unoriginal, curvilineal, diacritical, aboriginal, pleasure principle, conciliable, inexplicable, archiepiscopal, unconditional, individual, octosyllable

6 syllables:
aphrodisiacal, paradisiacal, inextinguishable, exclusion principle, definite integral

7 syllables:
indefinite integral, habitual criminal, reality principle, myelomeningocele, psychoanalytical, uncertainty principle

8 syllables:
pauli exclusion principle