2 syllables:
fissions, lycians, mission's, missions

3 syllables:
additions, admissions, ambitions, auditions, beauticians, clinicians, cognitions, commission's, commissions, conditions, demissions, edition's, editions, emissions, galicians, ignitions, logicians, magicians, monitions, morticians, munitions, musician's, musicians, musicians', omissions, opticians, partitions, patricians, permissions, petitions, physician's, physicians, physicians', positions, possitions, remissions, renditions, seditions, submissions, suspicions, tacticians, technician's, technicians, traditions, transitions, transmissions, tuitions, volitions

4 syllables:
acousticians, acquisition's, acquisitions, admonitions, aestheticians, air-conditions, airconditions, ammunitions, apparitions, appositions, coalition's, coalitions, competition's, competitions, compositions, cosmeticians, decommissions, definitions, demolitions, depositions, dieticians, dietitian's, dietitians, dispositions, disquisitions, ebullitions, electricians, electricians', estheticians, exhibitions, expeditions, expositions, extraditions, imbibitions, impositions, inhibitions, inquisitions, intermissions, intuitions, laodiceans, linguisticians, manumissions, mechanicians, noise conditions, obstetricians, opposition's, oppositions, phoneticians, politician's, politicians, politicians', precognitions, preconditions, premonitions, prepositions, prohibition's, prohibitions, propositions, recognition's, recognitions, reconditions, repartitions, repetitions, repositions, requisitions, retransmissions, rhetoricians, samogitians, ski conditions, statisticians, submunitions, superstitions, suppositions, transpositions

5 syllables:
academicians, arithmeticians, biometricians, cliometricians, contrapositions, cyberneticians, decompositions, diagnosticians, dialecticians, geometricians, geriatricians, indispositions, interpositions, juxtapositions, mathematicians, metaphysicians, neurotransmissions, paediatricians, pediatricians, predispositions, presuppositions, redefinitions, semioticians, superpositions, theoreticians, weather conditions

6 syllables:
basketball positions, bezos expeditions, econometricians, superimpositions, windows 10 editions

7 syllables:
list of apollo missions, list of murdered musicians

8 syllables:
iatromathematicians, thermosetting compositions

9 syllables:
american football positions

10 syllables:
meteorological conditions

2 syllables:
listens, prisons, rhythms, visions

3 syllables:
collisions, decisions, divisions, provisions, revisions