1 syllable:
all's, alls, baals, bahls, ball's, balls, balz, bawls, brawls, call's, calls, calze, caules, cauls, crawls, dahl's, dahls, dj qualls, doll's, dolls, dols, drawls, faal's, fall's, falles, falls, folles, galls, gauls, hall's, halls, hauls, kraals, lalls, mall's, malls, mauls, molls, myalls, nalls, palls, paul's, paules, pauls, pawls, poehl's, qualls, quals, ralls, rawles, rawls, salls, salz, sauls, schmalz, scrawls, shawls, smalls, spalls, sprawls, squalls, srawls, stalls, thralls, trawls, trollz, vaals, valls, waals, wall's, walles, walls, walz, wauls, yawls

2 syllables:
amal's, amdahl's, appalls, armholes, baseball's, baseballs, beachballs, befalls, birdcalls, blackballs, bookstalls, bradawls, bugyals, cabrall's, candaules, carryalls, casals, catcalls, consols, cornballs, cure-alls, dancehalls, deadfalls, degaulle's, deval's, downfalls, enthralls, enthrals, eyeballs, fastballs, fireballs, football's, footballs, footfalls, footwalls, forestalls, gadwalls, ghazals, gleichfalls, glycols, goofballs, great falls, guildhalls, hairballs, handballs, hardballs, headstalls, highballs, icefalls, ingalls, installs, jamal's, keelhauls, landfalls, lowballs, madballs, marshalls, mccall's, mcfalls, mcgols, meatballs, mothballs, newhall's, nidal's, no-balls, nutgalls, oddballs, ozal's, pinballs, pitfalls, pratfalls, pub-crawls, puffballs, rainfalls, recalls, riyals, rockfalls, ryals, sabol's, screwballs, seawalls, shortfalls, sidewalls, sioux falls, slimeballs, snowball's, snowballs, softballs, spaceballs, speedballs, spitball's, spitballs, starmalls, stonewalls, trackballs, twin falls, warhol's, whitehall's, whitewalls, windfalls, wormholes

3 syllables:
aerosols, andernfalls, angel falls, apiales, badesalz, base on balls, basketball's, basketballs, bittersalz, buckyballs, butterballs, butterschmalz, cannonballs, colemanballs, coveralls, disenthralls, disenthrals, ebenfalls, entisols, goldenthal's, goo goo dolls, horseshoe falls, hydrosols, kirtilals, klamath falls, know-it-alls, knuckleballs, labials, metaballs, montreal's, overalls, overcalls, overhauls, protocols, reinstalls, robocalls, sinqua walls, sohodolls, starting stalls, thiokol's, ultisols, uninstalls, unocal's, volleyballs, waterfalls, wherewithals, wonderfalls

4 syllables:
gravity falls, idaho-falls, neanderthals, niagara falls, paleosols, rutherford falls

5 syllables:
aerospatiale's, american falls, canadian falls, list of whaling walls, meridionals, the pussycat dolls, victoria falls, yosemite falls

6 syllables:
paulo afonso falls, spaghetti and meatballs

3 syllables:
catalogs