1 syllable:
-cule, b-school, beule, boole, bouille, boule, boulle, bruehl, brule, buehl, buel, buhl, choule, cool, coole, crool, cruel, deuil, dhool, dhule, doole, dreul, drool, dual, duell, dule, fool, frioul, fuel, ghoul, goole, grool, gueule, hoole, huile, j-school, jewel, joule, juel, jule, keule, khul', kool, kreul, luelle, muehl, muelle, mule, noule, pool, poole, poul, poule, reul, reule, rhule, roule, rrdtool, ruel, school, schuele, schule, scool, scrool, shmuel, shool, shoul, shule, skool, smule, spool, sproule, sproull, spruell, spruiell, spruill, spule, stool, thule, tooele, tool, toole, truel, tuel, tuell, tuille, tuyle, who'll, yeule, you'll, youll, yuill, yuille, yule, zeuhl

2 syllables:
abdul, adule, air-cool, aktuell, alcool, ampoule, arghool, art school, babool, babul, baiul, baoule, barbule, barstool, bascule, befool, blackpool, blastule, bloemkool, brit school, bulbule, cagoule, campstool, capul, car-pool, carpool, cerule, cesspool, chacmool, chevreul, chondrule, church school, ciboule, clausule, claypool, claypoole, close-stool, corcule, corneule, creepschool, cryptool, curule, dame-school, damfool, dance school, day school, deadpool, deepcool, deschool, dobule, drogoul, dromgoole, dzhambul, edge tool, ethtool, ethule, faldstool, fanduel, ferrule, ferule, festool, feuille, fistule, floccule, floscule, footstool, freedstool, frithstool, g.soul, george boole, girlpool, girlschool, glenpool, grade school, gribouille, guayule, gurule, gwenpool, hand tool, hangeul, heeltool, high-school, highschool, high school, home-rule, home-school, homeschool, hyrule, infule, insoul, jambool, jambul, kaboul, kagoul, kagoule, kurnool, lawn tool, law school, laycool, lemuel, les claypool, lobule, locule, lovefool, lucule, macule, makhoul, maqbool, mccool, medjool, millijoule, misrule, nabeul, nepool, night school, nucule, o'toole, old-school, old school, omtool, oscule, outfool, outschool, pecul, perule, pethuel, pilule, piquepoul, pistool, plantule, playschool, playskool, pre-school, precool, prep school, preschool, pustule, rahul, rantoul, raoul, raul, realschule, recule, retool, rookstool, ruhul, saccule, sandeul, saoul, self-rule, sertule, sesspool, spherule, sporule, steenkool, stepstool, step stool, teurgoule, texpool, that you'll, tidepool, tilleul, tim pool, toadstool, tomfool, top-tool, traboule, trade school, uncool, unfool, unspool, utsul, valvule, vanpool, vipul, vocule, welshpool, whirlpool, zebrule

3 syllables:
aedicule, after-school, afterschool, agrifuel, amuse-gueule, amygdule, april fool, arbuscule, as-30l, berufsschule, bishop-stool, boarding school, boerenkool, business school, canicule, caracul, caroncule, catholic school, chamisul, choir school, closestool, coronule, corpuscule, crepuscule, cutting tool, cuttystool, cutty stool, cysticule, dancing school, dental school, digitule, dindigul, driving school, ducking-stool, ducking stool, edicule, entitule, exajoule, exiftool, farigoule, fascicule, fenestrule, flying school, follicule, gameduell, garden tool, genepool, glomerule, grammar school, graticule, grembiule, groupuscule, hartlepool, hierodule, infant school, intercool, interschool, intitule, ipsambul, istanbul, junior school, kab-500l, karakul, karnivool, kilojoule, labor pool, languagetool, language school, lenticule, linalool, liverpool, lodicule, machine tool, machinule, majuscule, megajoule, metarule, middle school, milking stool, mille-feuille, minischool, minuscule, molecule, monocule, monticule, motorpool, motor pool, multi-tool, multitool, music school, music stool, nanojoule, neekolul, normal school, numbers pool, nursing school, opercule, opuscule, out-of-school, overrule, parannoul, pedascule, pedicule, pellicule, petajoule, picojoule, planetule, plastidule, poiseuille, pontypool, power tool, prison school, private school, propagule, public-school, public school, radebeul, radicule, ramuscule, reform school, reticule, ridicule, riding school, sabbath school, shaping tool, silicule, snipping tool, somnambule, spinnerule, sunday school, supercool, swimming-pool, swimming pool, tinkertool, tire tool, training school, ulcuscule, ullapool, unbefool, undercool, vanderpool, vanterpool, vestibule, wading pool, warrnambool, work-to-rule, wurbagool

4 syllables:
animalcule, annette o'toole, audiotool, bellefeuille, canalicule, chevrefeuille, christopher poole, composite school, disseminule, endoplastule, entrenching tool, graduate school, gram-molecule, gram molecule, hemispherule, intellektuell, junior high school, kab-1500l, lord of misrule, medical school, millefeuille, nonzero-rule, nursery school, old palace school, peter o'toole, petiolule, piano stool, poeticule, portefeuille, primary school, quatrefeuille, religious school, semifloscule, senior high school, technical school, tokyo ghoul

5 syllables:
anonymuncule, apostolopoul, biomolecule, comprehensive school, conciliabule, correspondence school, crazysexycool, dipole molecule, elementary school, engineering school, historical school, macromolecule, parochial school, protein molecule, secondary school, supermolecule, supramolecule, the god of high school, veterinary school, vocational school

6 syllables:
cyril abiteboul, preparatory school, secretarial school

7 syllables:
olympic-size swimming pool, secondary modern school