3 letters:
all, bol, dol, lol, mol, pol, sol, tal, tol, wal, ole, rol

4 letters:
amal, awol, ball, bawl, call, caul, coll, dahl, doll, fall, gall, gaul, goll, hall, haul, loll, mall, maul, moll, pall, paul, raul, saul, tall, wall, bole, boll, bowl, coal, cole, dole, foal, goal, hole, kohl, mole, noll, pole, poll, role, roll, sole, soul, stol, tole, toll

5 letters:
aldol, banal, brawl, cabal, cecal, crawl, drawl, graal, hemal, jamal, kraal, lysol, molle, natal, nepal, ramal, riyal, scall, shawl, small, spall, stall, taxol, trawl, wrawl, y'all, yigal, anole, atole, dhole, droll, extol, knoll, parol, prole, seoul, shoal, skoal, stole, thole, tirol, troll, whole

6 letters:
apodal, appall, at all, befall, devall, duvall, glycol, in all, mccall, recall, scrawl, sprawl, squall, sterol, thrall, withal, cajole, citole, dipole, enroll, formol, gambol, indole, nicole, oriole, parole, patrol, pinole, resole, scroll, stroll, unroll

7 letters:
aerosol, alcohol, armhole, bradawl, butanol, caporal, catcall, drywall, end-all, enthral, ethanol, eyeball, gadwall, gasohol, heimdal, hematal, icefall, install, lowball, netball, no ball, oddball, outcall, outfall, outhaul, overall, panadol, pinball, pitfall, retinol, romanal, seawall, senegal, timolol, bedroll, borneol, bricole, cariole, condole, console, control, creosol, eyehole, foxhole, keyhole, logroll, manhole, maypole, no-goal, ostiole, outsole, payroll, petiole, pinhole, pistole, pothole, pyrrole, rathole, redpoll, rissole, skatole, spyhole, systole, tadpole, urceole, variole, walpole

8 letters:
backhaul, bannerol, baseball, beanball, birdcall, blowball, carbinol, catchall, cornball, cortisol, coverall, cue ball, cure-all, downfall, downhaul, dry wall, enthrall, evenfall, fastball, fireball, fly ball, folderol, football, footfall, footwall, gildhall, gingerol, goofball, gum ball, gun moll, haematal, hairball, handball, hardball, heal all, heimdall, highball, hydrosol, keelhaul, know-all, landfall, meatball, methanol, montreal, mothball, net ball, orenthal, overcall, overhaul, pratfall, propanol, protocol, puffball, pushball, rag doll, rainfall, rockfall, rohypnol, sangraal, save-all, sidewall, snowball, softball, sorbitol, sourball, spitball, tea ball, windfall, wormhole, zenithal, air hole, asystole, bankroll, beanpole, blowhole, borecole, borehole, bunghole, camisole, capriole, caracole, charcoal, coalhole, ear hole, egg roll, escarole, espanole, fishbowl, flagpole, fox hole, fumarole, gloriole, glycerol, hellhole, hop pole, interpol, knothole, loophole, metrazol, monopole, nucleole, oversoul, peephole, pesthole, pimproll, plughole, porthole, posthole, red cole, red poll, sea coal, sea cole, seminole, sinkhole, ski pole, stamboul, top-hole, venthole, washbowl

9 letters:
above all, alecithal, autosomal, bismuthal, blackball, blackpoll, blastemal, buckyball, cell wall, city hall, dirt ball, earthball, fair ball, fish ball, forestall, foul ball, golf ball, guildhall, hair ball, jump ball, long haul, mail call, mess hall, mestranol, nightfall, paintball, pall-mall, polo ball, pool ball, pub-crawl, pub crawl, punchball, reinstall, roll call, rosenthal, screwball, shortfall, sick call, speedball, spend-all, stickball, stonewall, time-ball, toll call, town hall, trackball, transvaal, viosterol, waterfall, whitehall, whitewall, amphibole, arteriole, bolt-hole, bore-hole, calcicole, casserole, catchpole, centriole, chuckhole, cubbyhole, dead soul, decontrol, deed poll, dicumarol, drum roll, dust bowl, farandole, funk hole, girandole, glycerole, gray sole, half sole, hard coal, hard roll, hawsehole, innersole, jellyroll, lodgepole, millimole, nail hole, pipe bowl, post hole, rantipole, rent-roll, ridgepole, rigmarole, rocambole, sand sole, shot hole, slop bowl, snap roll, soft coal, soft roll, soup bowl, steamroll, stokehole, superbowl, thumbhole, touchhole, wood coal

10 letters:
all in all, barcarolle, basketball, beach ball, bocce ball, brandyball, bugger all, bugle call, butterball, calciferol, cannabinol, cannonball, close call, crank call, crown gall, curve ball, dance hall, earth-ball, eight ball, ereshkigal, ergosterol, gable wall, glove doll, greaseball, great hall, hypaethral, local call, manor hall, megesterol, melon ball, microsomal, music hall, party wall, phone call, resorcinol, rifle ball, rugby ball, saint paul, stone wall, tetherball, trunk call, volleyball, as a whole, barge pole, bibliopole, black hole, brown coal, buttonhole, carmagnole, death-roll, drill hole, field goal, glory hole, lemon sole, minor role, mouth hole, north pole, omeprazole, onion roll, ozone hole, pigeonhole, pratincole, punch bowl, range pole, rigamarole, salad bowl, sevastopol, smoke hole, sound hole, south pole, steam coal, sugar bowl, sweet roll, title role, totem pole, typhlosole, water hole

11 letters:
amplexicaul, cannon ball, cholesterol, cotton ball, eresh-kigal, front crawl, ground ball, hiring hall, isopropanol, know-it-all, knuckleball, line squall, margin call, masked ball, musket ball, muster call, neanderthal, object ball, paracetamol, racquetball, soccer ball, squash ball, system call, tennis ball, therewithal, wherewithal, barrel roll, blastocoele, bullet hole, button hole, cereal bowl, church roll, coffee roll, finger-roll, finger bowl, finger hole, golden mole, gopher hole, gun control, heart-whole, job control, kaiser roll, mixing bowl, muster roll, profiterole, rabbit hole, spring roll, stilbestrol, toilet bowl, toilet roll, vienna roll

12 letters:
apostle paul, ashurbanipal, bearing wall, bowling ball, chinese wall, coffee stall, collect call, concert hall, cricket ball, croquet ball, curtain call, feather ball, first of all, free-for-all, hanging wall, off-the-wall, popcorn ball, port of call, prayer shawl, sawdust doll, service call, shower stall, skittle ball, tammany hall, urban sprawl, wailing wall, wall-to-wall, wood alcohol, arms control, birthcontrol, english sole, extrasystole, fire control, fishing pole, lose control, on the whole, ranging pole, riot control, sausage roll, self-control, shore patrol, swallow hole, take control

13 letters:
assembly hall, billiard ball, billiard hall, breaking ball, butyl alcohol, entrance hall, ethyl alcohol, function call, grain alcohol, lacrosse ball, medicine ball, methocarbamol, punching ball, roulette ball, shopping mall, barber's pole, birth control, body and soul, border patrol, brewer's mole, cinnamon roll, crescent roll, crowd control, european sole, flood control, golden oriole, magnetic pole, motor control, negative pole, positive pole, price control, rock-and-roll, rock and roll, swimming hole, under control, watering hole

14 letters:
abdominal wall, be on the ball, dehydroretinol, ergocalciferol, geranium molle, methyl alcohol, porcupine ball, residence hall, rugby football, submarine ball, telephone call, touch football, beyond control, celestial pole, cruise control, damage control, fillet of sole, hamburger roll, heart and soul, marsupial mole, orchard oriole, remote control, robert walpole, social control, telegraph pole, telephone pole

15 letters:
chloramphenicol, cholecalciferol, cholecarciferol, conference call, ethylene glycol, exhibition hall, masquerade ball, playground ball, rubbing alcohol, steroid alcohol, tribromoethanol, american oriole, anthracite coal, bituminous coal, electric dipole, gaining control, magnetic dipole, northern oriole, quality control, theatrical role, traffic control

16 letters:
absolute alcohol, australian crawl, capital of nepal, hole-in-the-wall, interim overhaul, once and for all, propylene glycol, swedish meatball, baltimore oriole, bullock's oriole, military control, new world oriole, old world oriole, toad-in-the-hole

17 letters:
american football, denatured alcohol, field hockey ball, chicken casserole, inventory control, magnetic monopole, parker house roll, pentylenetetrazol

18 letters:
activated charcoal, diethylstilbestrol, population control, sir robert walpole

19 letters:
public opinion poll

20 letters:
association football, fermentation alcohol, tetrahydrocannabinol, north celestial pole, south celestial pole

21 letters:
pellitory-of-the-wall, professional baseball, professional football, saints peter and paul

22 letters:
file transfer protocol, negative magnetic pole, pentamethylenetetrazol, positive magnetic pole

23 letters:
communications protocol, professional basketball

26 letters:
center for disease control

27 letters:
hypertext transfer protocol

29 letters:
transmission control protocol

30 letters:
rhythm method of birth control

32 letters:
anonymous file transfer protocol, calendar method of birth control