2 letters:
be, cv, ev, ms

3 letters:
act, aid, bad, biz, bum, bus, buy, car, dig, erg, job, man, nil, pay, pen, pop, rat, sit, use, vet

4 letters:
book, bulk, busy, call, camp, care, core, door, down, duty, ease, fair, farm, flat, game, gang, germ, gist, heap, help, here, hire, hope, hunt, idle, kill, land, lazy, love, mesh, moil, monk, move, opus, osha, page, paid, peon, pile, plan, play, plot, prep, race, rack, rask, rest, ride, scab, seed, ship, slog, spec, spin, take, talk, task, team, text, till, toil, tool, town, wash, week, yoke

5 letters:
alger, along, apply, badly, beats, bos'n, bosun, break, brush, caste, chore, claim, clerk, craft, demur, dewar, draft, drama, dream, drive, drown, fatah, field, foist, gabor, genre, golgi, goner, grain, great, grind, heavy, hours, idler, jolly, joule, kw-hr, label, labor, leave, lowly, manet, merit, motif, navvy, novel, piece, plane, power, price, salon, scant, serve, sewer, share, shift, skimp, slack, slave, sloth, soddy, spell, start, stint, sweat, theme, thing, title, trade, trick, value, whirl, write

6 letters:
action, active, afraid, annals, artist, assist, attack, attend, baddie, bailey, baldly, beaver, behind, bo's'n, bo'sun, botchy, brakes, burden, caning, carter, chanty, clinic, closet, commit, credit, cutter, dabble, design, device, drudge, effect, effort, employ, energy, engage, engine, epilog, escape, evolve, examen, excuse, figure, finish, follow, ganger, garden, graham, heller, humble, indite, intern, jerome, joiner, jument, labour, layoff, leakey, loafer, master, mature, menial, molded, monkey, notice, object, oblate, origen, otiose, payday, picket, platen, potter, praise, puddle, putter, recess, report, repose, resume, retire, salute, seduce, shanty, shaped, skivvy, slight, source, stemma, strike, stucco, system, thanks, tinker, travel, trowel, undone, unwell, utopia, vestry, welter, wetter, wicker, widely, wilson, wiring, wright

7 letters:
agonist, amazing, arduous, average, balance, belabor, capsule, cartage, carting, chantey, chapter, coating, commute, compose, correct, crewman, daycare, day off, deflate, deserve, despise, develop, diagram, distaff, economy, editing, embassy, entropy, episode, essence, example, excerpt, exhaust, expense, exploit, extract, fatigue, fauvism, ferment, festoon, fiction, fischer, footage, forfeit, graphic, grumble, gun dog, heroine, hokusai, holiday, hopkins, hunting, inertia, ingrain, inspire, ironing, keep up, keynote, logging, logroll, make up, measure, migrant, mission, molding, nursing, obscure, outlier, overall, pattern, peonage, premier, project, promote, publish, puritan, referee, refiner, require, respite, retired, sailing, serious, service, shining, shirker, skipper, slacker, slavery, smatter, smeared, special, stay up, support, suppose, swagger, swagman, swamped, tacitly, take up, tending, toiling, travail, utilise, utilize, variety, version, villain, wait on, washing, wherein, wildcat, work-in, workbag, workbox, workday, working, work in, writing, wrought, yardman

8 letters:
abridger, alsatian, analecta, analects, argument, asynergy, attitude, avogadro, baby-sit, backseat, belabour, blackleg, blue law, bodywork, boringly, burdened, busywork, casebook, casually, clerical, clock in, clock on, commuter, conflict, continue, contrast, contrive, covering, creative, day care, dictator, dingdong, drudgery, drudging, dystopia, ensemble, enthalpy, epilogue, exercise, exertion, faineant, farm out, fascicle, followup, freeload, gardener, get down, glorious, hackwork, hamilton, handwork, heartily, herschel, homework, idleness, inactive, increase, indicate, indolent, inscribe, instruct, ironwork, laboring, lacework, lavation, lawrence, layabout, laziness, lifework, live out, longueur, long run, man hour, minister, mistress, modeling, monastic, monotony, moulding, mutilate, openwork, original, overlook, overtime, overwork, painless, passable, pastiche, pastoral, peg away, pittance, planking, planting, plodding, premiere, printing, producer, punch in, reassign, recreate, reliance, scenario, shirking, skulking, slacking, slapdash, sloppily, slothful, spurious, standard, surtitle, tabletop, take off, take out, teamwork, timecard, timework, time off, time out, tireless, transfer, unlovely, untiring, vacation, vegetate, vocation, walk out, warhorse, woodwork, work-shy, workflow, workload, workroom, workweek, work day, work off, work out

9 letters:
actuarial, apparatus, asynergia, attend to, attention, authority, boatswain, carpenter, character, clinician, clock off, clock out, co-worker, colleague, congenial, cooperate, copyright, craftsman, criticism, cunctator, day shift, day watch, duct tape, elaborate, eyestrain, faineance, fascicule, foliation, follow-up, germinate, handcraft, handiwork, heat unit, high time, housework, inclusion, indolence, influence, interfere, interlock, inundated, inventory, itinerant, itinerate, labouring, long haul, loose end, make-work, mechanize, migratory, modelling, moonlight, nightwork, numerical, obscurely, operation, outsource, overdrive, paperwork, paradisal, paragraph, performer, photocopy, piecework, plug away, polishing, postponer, probation, procedure, punch out, recognize, redaction, reference, rush hour, sculpture, seafaring, secretary, selection, sleep out, spadework, specialty, stagehand, talk shop, tea break, tiredness, tonsorial, volunteer, weariness, whistling, workboard, workpiece, workplace, worksheet, workspace, work song, work time, work unit

10 letters:
abridgment, accustomed, adaptation, administer, apprentice, archimedes, asthenopia, autotelism, boilersuit, boondoggle, brainchild, castration, clean room, comparably, compendium, coursework, crossroads, cyclopedia, dedication, definitive, denouement, deployment, discipline, dissection, do-nothing, donkeywork, draft copy, efficiency, ethnologic, foot-pound, free-lance, handicraft, heavy-duty, humiliated, impression, jolly boat, light-duty, manuscript, navigation, needlework, overburden, particular, peripeteia, plagiarism, praetorian, presuppose, randomness, recognized, relaxation, resolution, rock maple, scrimshank, shop floor, sick leave, silverwork, soldiering, specialise, specialism, speciality, specialize, spot check, straw boss, supertitle, taskmaster, time clock, tranquilly, tulip tree, unassuming, ungenerous, vacationer, waterpower, white room, wickerwork, wordsworth, workaholic, workbasket, workfellow, work shift

11 letters:
abbreviator, abridgement, absenteeism, application, babysitting, beauty shop, beaver away, bench clamp, blue-collar, buckle down, carefulness, collaborate, composition, contributor, coordinator, copyrighted, cross-index, cyclopaedia, day nursery, deliverance, demoralized, diffidently, diving bell, duty period, electioneer, energy unit, ergotropism, expurgation, goofing off, hardworking, heat engine, housewifery, industrious, inscription, inspiration, interactive, join forces, lacquerware, leatherwork, lucubration, magnum opus, malingering, masterpiece, mess around, move around, muck around, needlecraft, negligently, nightingale, night shift, objet d'art, outstanding, out of work, peer review, person hour, play around, preparation, priestcraft, proletariat, protagonist, publication, put to work, realization, recognition, requirement, romanticize, sea chantey, secretarial, subcontract, sugar maple, swing shift, syndication, synergistic, temporarily, theretofore, undertaking, unfeelingly, unnaturally, vacationist, water wagon, watt second, working day, working dog

12 letters:
administrate, architecture, beauty salon, boilers suit, brake system, breast drill, carnot cycle, coffee break, condensation, elbow grease, encyclopedia, ethnological, foot-poundal, galley slave, get together, goldbricking, guest worker, half-holiday, housekeeping, inaccessible, inconsequent, knuckle down, like thunder, mathematical, needleworker, office block, organisation, organization, overburdened, period piece, propertyless, remuneration, remunerative, reproduction, section gang, sick benefit, simon legree, slave driver, slothfulness, smooth plane, sporting dog, tulip poplar, undocumented, wage-earning, water waggon, well-ordered, white-collar, working rule

13 letters:
absentee rate, army engineer, author's name, beauty parlor, catch up with, chef-d'oeuvre, complainingly, conscientious, cutting angle, electron volt, encyclopaedia, evening shift, fellow worker, galvanization, glass ceiling, gratification, hand in glove, horatio alger, investigating, investigation, kilowatt hour, labor of love, legal holiday, monkey around, paid vacation, picture plane, piet mondrian, plain clothes, punctiliously, republication, retrospective, specification, superannuated, take time off, tout ensemble, underestimate, uninterrupted, unpaid worker, working-class, working class, work stoppage, writer's name, writing board, yellow poplar

14 letters:
acer saccharum, beauty parlour, building block, civilian dress, clock-watching, deconstruction, disingenuously, electric motor, kilogram-meter, labour of love, latchkey child, piece of music, poetic license, procrastinator, reconstruction, reference work, specialisation, specialization, street clothes, superannuation, world premiere

15 letters:
acknowledgement, amedeo avogadro, beast of burden, beat generation, creative person, cross-reference, day care center, factory whistle, foreign mission, full employment, german shepherd, graveyard shift, horsepower-hour, incompatibility, inconsequential, mechanic's lien, missionary post, missionary work, office building, parkinson's law, progress report, retirement fund, smoothing plane, time and a half

16 letters:
break one's back, busman's holiday, canary whitewood, commuter traffic, curriculum vitae, disability check, fictionalisation, fictionalization, leave of absence, local department, national holiday, retirement check, sheet-metal work, shipboard system, sickness benefit, society of jesus, stage technician, work in progress, written material

17 letters:
assistant foreman, civilian clothing, deconstructionism, german police dog, government office, health profession, literary argument, military engineer, needlenose pliers, performing artist, physical exertion, unemployment rate, working agreement, working principle

18 letters:
disability payment, employee ownership, literary criticism, missionary station, nervous exhaustion, occupational group, retirement benefit, william wordsworth

19 letters:
board of trade unit, diplomatic building, fictional character, german shepherd dog, musical composition, nervous prostration, unfinished business

20 letters:
child welfare agency, fictitious character, florence nightingale

21 letters:
child welfare service, secretarial assistant, travel back and forth

22 letters:
holy day of obligation

23 letters:
employee-owned business, liriodendron tulipifera

25 letters:
employee-owned enterprise

26 letters:
right of first publication

28 letters:
second law of thermodynamics

30 letters:
department of local government