2 syllables:
bhunder, blunder, bundar, bunder, chunder, dunder, dundore, flunder, funder, fundir, grunder, grund der, gunder, hundre, inder, indre, klunder, lunder, mondar, munder, plunder, sunder, thunder, under, under-, und der, vlinder, wonder, wunder

3 syllables:
abundar, asunder, bewonder, bob under, boy wonder, confundir, daigunder, difundir, dissunder, fall under, go under, like thunder, misunder, pop-under, put under, refunder, unwonder, upthunder, war thunder, wefunder

4 syllables:
all-in-wonder, blood-and-thunder, buckle under, going under, knuckle under, newtown wonder, over-under, up-and-under, wirtschaftswunder

5 syllables:
kentucky wonder, quigley down under

8 syllables:
cac/pac jf-17 thunder, oklahoma city thunder

2 syllables:
dumper, shunter, tunker, bunker, stumper, dunker, monger, bunter, hunger, clumber, umber, slumber, junker, number, younker, hunter, punter, cumber, younger, jumper, lumper, bumper, lumber

3 syllables:
real number, encumber, outnumber, ski jumper, wave number, whole number, f number, mass number, mach number, spelunker, phone number, prime number, call number, chiseler, christopher, cinnabar, cricketer, cylinder, driveller, fiddler, filature, fistular, ignitor, insecure, insofar, insular, integer, kibitzer, kitchenware, ligature, lincolnshire, listener, lithosphere, littler, millibar, minister, missioner, prisoner, riveter, signaler, signaller, signature, similar, simpler, singapore, singular, skin colour, spinnaker, sprinkler, stickler, stiffener, stilt plover, swindler, sycamore, thickener, tickler, titular, victualer, victualler, vinegar, visitor, wiggler, windjammer, wriggler

4 syllables:
disencumber, fortune hunter, magic number, compound number, octane number, index number, complex number, acicular, administer, altimeter, apishamore, articular, brake cylinder, calicular, calligrapher, capitular, collimator, commissioner, conditioner, contributor, cuticular, dissimilar, distributor, dosimeter, estimator, exhibitor, funicular, herb christopher, inhibitor, inquisitor, judicature, key signature, large integer, lenticular, new englander, parishioner, particular, perimeter, petitioner, positioner, practitioner, prime minister, provisioner, reticular, saint christopher, solicitor, time signature, vermicular, wine vinegar, wood vinegar

5 syllables:
natural number, opposite number, rational number, cardinal number, atomic number, telephone number, argentinosaur, bank commissioner, calorimeter, chili vinegar, cider vinegar, colorimeter, colourimeter, countersignature, exhibitioner, finance minister, foreign minister, hay conditioner, high commissioner, in particular, master cylinder, park commissioner, perpendicular, polarimeter

6 syllables:
transcendental number, irrational number, algebraic number, registration number, cabinet minister, dental practitioner, extracurricular, government minister, housing commissioner, police commissioner

7 syllables:
imaginary number, american sycamore, arizona sycamore, california sycamore, capital of singapore, diplomatic minister, general practitioner, hydraulic brake cylinder, medical practitioner, musical time signature, political prisoner, resident commissioner

8 syllables:
social security number, electrical distributor, element of a cylinder

9 syllables:
bank identification number