1 syllable:
boules, brules, cools, crewels, cstools, cules, drools, fool's, fools, ghouls, gules, joules, jules, kools, mewls, moules, mules, pool's, pools, pules, rule's, rules, school's, schools, schools', shuls, soules, spools, stools, tools, tules, uhls, yules

2 syllables:
blue hills, cruels, duals, duels, fuel's, fuels, newell's, newels, alcools, ampoules, baiul's, banyuls, barbules, bascules, befools, cagoules, carpools, cesspools, chondrules, drogoul's, dromgooles, ferrules, ferules, feuilles, fish-pools, floccules, footstools, greatschools, highschools, itools, lobules, locules, macules, mavroules, misrules, mootools, pilules, preschools, pustules, rauls, retools, saccules, samtools, seatools, shapetools, smallpools, spherules, sun-stools, toadstools, tomfools, valvules, vanpools, w3schools, whirlpool's, whirlpools

3 syllables:
accruals, refuels, renewals, reviewals, synfuels, agrifuels, cachirules, caraculs, cdrtools, daemon tools, fencing rules, graticules, karakuls, kilojoules, lodicules, majuscules, minuscules, molecules, opuscules, overrules, peopletools, propagules, reticules, ridicules, setuptools, smartmontools, vestibules

4 syllables:
biofuels, pansexuals, transexuals, animalcules, disseminules, system of rules

5 syllables:
ambisexuals, homosexuals, metrosexuals, 8 simple rules, biomolecules, macromolecules