2 syllables:
caixin, checks in, hexen, hexone, lexan, nexin, nexon, rexon, sexson, sex in, vexin

3 syllables:
annexin, behexen, calnexin, connexin, connexon, direccin, he kexin, infeccin, neutrexin, orexin

4 syllables:
haemopexin, hemopexin, teguexin

5 syllables:
apicomplexan

2 syllables:
flexion, flection, section, stepson

3 syllables:
advection, connexion, reflection, dissection, protection, election, conception, injection, collection, inflection, rejection, inception, direction, refection, perfection, exception, infection, dejection, subjection, affection, convection, defection, inspection, abjection, correction, erection, perception, confection, complexion, deception, bisection, cross section, selection, objection, ejection, projection, connection, reception, deflection, detection, brass section, c-section, complection, cross-section, deflexion, inflexion, plane section, reed section, reflexion, sports section, string section

4 syllables:
map projection, predilection, insurrection, retroflection, disconnection, venesection, introjection, contraception, interjection, retrospection, by election, indirection, intersection, vivisection, resurrection, apperception, intellection, reelection, conic section, quarter section, recollection, circumspection, retroflexion, preconception, golden section, self-deception, stage direction, disaffection, rhythm section, disinfection, misdirection, imperfection, misconception, introspection, genuflection, interception, art collection, bye election, by selection, coin collection, eye infection, genuflexion, loan collection, map collection, self-direction, self-protection, sound perception, sound reflection, speech perception, stamp collection, suprainfection, take exception, taste perception, tax collection, touch perception, to perfection, trade protection, trash collection, trumpet section

5 syllables:
interconnection, interoception, intussusception, exteroception, vincent's infection, garbage collection, house of correction, fungal infection, conic projection, proprioception, caesarean section, focal infection, superinfection, bottle collection, change of direction, clarinet section, cordial reception, giving protection, mental rejection, overprotection, rental collection, right of election, sense of direction, signal detection, vertical section, violin section, wedding reception, writ of election

6 syllables:
natural selection, mercator projection, angle of reflection, primary election, visual perception, general election, conical projection, horizontal section, musical perception, mutual affection, offering protection, point of intersection

7 syllables:
intravenous injection, auditory perception, immaculate conception, electronic deception, favorable reception, olfactory perception

8 syllables:
urinary tract infection, opportunistic infection, extrasensory perception, coefficient of reflection

11 syllables:
electronic imitative deception, imitative electronic deception

12 syllables:
electronic manipulative deception, manipulative electronic deception