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, rule, school, schuele, schule, scool, scrool, shmuel, shool, shoul, shule, skool, smule, spool, sproule, sproull, spruell, spruiell, spruill, spule, stool, thule, tooele, 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, board rule, 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, ethtool, ethule, faldstool, fanduel, ferrule, ferule, festool, feuille, fistule, floccule, floscule, footstool, foot rule, freedstool, frithstool, g.soul, gag rule, george boole, girlpool, girlschool, glenpool, grade school, gribouille, ground rule, guayule, gurule, gwenpool, hangeul, heeltool, high-school, highschool, high school, home-rule, home-school, homeschool, home rule, hyrule, infule, insoul, jambool, jambul, kaboul, kagoul, kagoule, kurnool, 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, plumb rule, pre-school, precool, prep school, preschool, pustule, rahul, rantoul, raoul, raul, realschule, recule, retool, rookstool, ruhul, saccule, sandeul, saoul, self-rule, sertule, sesspool, slide rule, 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, 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, genepool, glomerule, golden rule, grammar school, graticule, grembiule, groupuscule, hartlepool, hearsay rule, hierodule, infant school, intercool, interschool, intitule, ipsambul, istanbul, junior school, kab-500l, karakul, karnivool, kilojoule, labor pool, languagetool, language school, lenticule, linalool, liverpool, lodicule, 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, prison school, private school, propagule, public-school, public school, radebeul, radicule, ramuscule, reform school, reticule, ridicule, riding school, sabbath school, silicule, somnambule, spinnerule, sunday school, supercool, swimming-pool, swimming pool, tinkertool, training school, ulcuscule, ullapool, unbefool, undercool, vanderpool, vanterpool, vestibule, wading pool, warrnambool, work-to-rule, working rule, wurbagool

4 syllables:
animalcule, annette o'toole, audiotool, bellefeuille, canalicule, carpenter's rule, chevrefeuille, christopher poole, composite school, disseminule, endoplastule, graduate school, gram-molecule, gram molecule, hemispherule, intellektuell, junior high school, kab-1500l, linguistic rule, 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, best evidence rule, biomolecule, comprehensive school, conciliabule, correspondence school, crazysexycool, dipole molecule, elementary school, engineering school, grammatical rule, historical school, macromolecule, majority rule, parochial school, protein molecule, secondary school, supermolecule, supramolecule, the god of high school, veterinary school, vocational school

6 syllables:
cyril abiteboul, exclusionary rule, preparatory school, secretarial school

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

9 syllables:
korea under japanese rule