1 syllable:
-decked, -necked, -sect, becht, becked, brecht, checked, chek-dt, decked, dsect, fecht, fecked, flecked, hecht, hect-, jtekt, kecked, knecht, necked, pecht, pecked, precht, recht, recked, recte, schlecht, sect, secte, seked, sekte, snecked, specht, specked, speckt, spect, trekked, v-necked, wecht, wrecked

2 syllables:
advect, affect, albrecht, allect, arrect, aspect, atrecht, aufrecht, bedecked, bedeckt, bisect, bullnecked, cilect, collect, collecte, complect, confect, conject, connect, contect, convect, corect, correct, crosschecked, defect, defekt, deflect, deject, deregt, despect, detect, detrect, direct, directe, dissect, dordrecht, effect, eject, elect, enfect, entrecte, erect, exect, expect, exsect, flyspecked, half-decked, hambrecht, henpecked, humect, infect, inflect, inject, insect, insecte, insekt, inspect, invect, kinect, konfekt, moordrecht, neglect, object, obtect, pandect, perfect, perfekt, porrect, prefect, prelect, pro-ject, project, protect, provect, rechecked, rednecked, refect, reflect, reject, resect, respect, rupprecht, schiltknecht, select, senkrecht, spot-checked, subject, subnect, suspect, suspekt, traject, tranect, transect, trisect, unchecked, unecht, utecht, utrecht, vpec-t, wrynecked

3 syllables:
5select, acrolect, amish sect, analect, anderlecht, architect, architecte, architekt, artilect, aufgeregt, barenecked, basilect, bitconnect, bottlenecked, by-respect, caverject, child neglect, circumflect, circumspect, codirect, counterchecked, cross-connect, deselect, dialect, dialecte, dialekt, disaffect, disconnect, disinfect, disrespect, double-checked, double-decked, droste effect, dr disrespect, ethnolect, freshdirect, genderlect, genuflect, hemisect, incorrect, indirect, intellect, interject, intersect, intertect, introspect, in effect, jetdirect, leaf insect, leberecht, liege subject, mesolect, misaffect, miscorrect, misdirect, multisect, non-direct, nondirect, nonelect, note-perfect, parkitect, past perfect, pluperfect, predilect, preelect, preerect, preselect, privatrecht, quadrisect, quantconnect, quickselect, rape suspect, re-collect, re-elect, re-erect, recollect, reconnect, redirect, reelect, reerect, reinfect, reinspect, reselect, resurrect, retrospect, rubbernecked, scale insect, schildknecht, self-correct, self-neglect, self-respect, semierect, short subject, side-effect, side effect, skin effect, sound effect, stage direct, stage effect, starchitect, stick insect, suberect, take effect, topolect, transperfect, turtlenecked, uncorrect, undirect, unerect, unperfect, unprotect, unrespect, unselect, unsuspect, venesect, vivisect, wax insect, word-perfect, wreckx-n-effect, write-protect

4 syllables:
after-effect, aftereffect, autocorrect, coattails effect, dopplereffekt, doppler effect, eyebuydirect, future perfect, greenhouse effect, hypercorrect, idiolect, incircumspect, interconnect, introselect, in that respect, law of effect, letter-perfect, microinject, min dialect, misrecollect, murder suspect, openconnect, oranjegekte, over-correct, overaffect, overcorrect, overprotect, photoeffect, picture-perfect, pinnatisect, present perfect, preterperfect, semi-erect, sociolect, special effect, spittle insect, superinfect, superinspect, teleconnect, tigerdirect, transdialect, uncircumspect, unwind-protect, urheberrecht, willful neglect, with all respect, wu dialect, yue dialect

5 syllables:
1-800-collect, beijing dialect, bipinnatisect, flemish dialect, landscape architect, president-elect, preterimperfect, preterpluperfect, progressive aspect, robbery suspect, sciencedirect, shanghai dialect, ubisoft connect, visual aspect

6 syllables:
cantonese dialect, mandarin dialect

7 syllables:
triboelectric effect