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:
asunder, bewonder, bob under, boy wonder, confundir, daigunder, difundir, dissunder, fall under, go under, infundir, 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:
handler, bumper, bunker, bunter, clumber, cumber, dumper, dunker, hunger, hunter, jumper, junker, lumber, lumper, monger, number, plunker, punter, shunter, slumber, stumper, tunker, umber, unbar, younger, younker

3 syllables:
balancer, crackleware, canister, rattler, bachelor, matador, cannoneer, glandular, aquifer, lacklustre, lavender, prattler, manager, scapular, traveler, traveller, chancellor, vascular, fastener, samovar, handlebar, grandmother, lancaster, tanager, ampullar, bannister, granular, sapsucker, atmosphere, amateur, half-brother, papaver, landlubber, acinar, scavenger, hadrosaur, absconder, saddler, clawhammer, hackamore, annular, cavalier, avatar, salvador, wrangler, labrador, basilar, catheter, calendar, challenger, wagoner, canvasser, bandoleer, caliber, battledore, cannular, falconer, passenger, massacre, jacamar, malodor, man-of-war, palaver, gadgeteer, phalanger, blackamoor, lackluster, waggoner, tablature, baluster, zanzibar, angular, caliper, blastomere, blastosphere, albacore, janitor, stratosphere, straphanger, back-number, box-number, bug-hunter, call number, encumber, fox hunter, f number, large number, mach number, mass number, outnumber, page number, phone number, pole jumper, pothunter, prime number, real number, ski jumper, spelunker, stop number, the hunter, tub-thumper, wave number, whole number, witch-hunter

4 syllables:
spectacular, avascular, enamelware, peradventure, apatosaur, tyrannosaur, ambassador, rectangular, diameter, embassador, stage manager, great grandmother, snap fastener, san salvador, capacitor, lord chancellor, vernacular, slide fastener, triangular, decameter, parameter, spike lavender, el salvador, excalibur, milliammeter, knight bachelor, examiner, gametophore, titanosaur, sea lavender, decaliter, pentangular, elastomer, dekameter, kala-azar, vice chancellor, oracular, complex number, compound number, disencumber, fortune hunter, index number, license number, lion-hunter, magic number, octane number, power hunger, po box number

5 syllables:
jewish calendar, city manager, enantiomer, acetabular, fellow traveler, hindu calendar, roman calendar, atomic number, cardinal number, natural number, opposite number, parachute jumper, rational number, telephone number

6 syllables:
julian calendar, vernier caliper, cardiovascular, algebraic number, irrational number, registration number, transcendental number

7 syllables:
medical examiner, gregorian calendar, imaginary number

8 syllables:
identification number, pure imaginary number, social security number

9 syllables:
bank identification number

12 syllables:
imaginary part of a complex number