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, 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, 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, slimeballs, snowball's, snowballs, softballs, spaceballs, speedballs, spitball's, spitballs, starmalls, stonewalls, trackballs, warhol's, whitehall's, whitewalls, windfalls, wormholes

3 syllables:
aerosols, alcohols, andernfalls, apiales, badesalz, base on balls, basketball's, basketballs, bittersalz, buckyballs, butterballs, butterschmalz, cannonballs, colemanballs, coveralls, disenthralls, disenthrals, ebenfalls, entisols, goldenthal's, goo goo dolls, hydrosols, kirtilals, 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:
idaho-falls, neanderthals, paleosols

5 syllables:
aerospatiale's, list of whaling walls, meridionals, the pussycat dolls

6 syllables:
spaghetti and meatballs