The Collaborative International Dictionary of English v.0.48:

Draughtsman \Draughts"man\, n.; pl. Draughtsmen.
   1. One who draws pleadings or other writings.
      [1913 Webster]

   2. One who draws plans and sketches of machinery, structures,
      and places; also, more generally, one who makes drawings
      of any kind.
      [1913 Webster]

   3. A "man" or piece used in the game of draughts.
      [1913 Webster]

   4. One who drinks drams; a tippler. [Obs.] --Tatler.
      [1913 Webster]

WordNet (r) 3.0 (2006):

draughtsman
    n 1: a skilled worker who draws plans of buildings or machines
         [syn: draftsman, draughtsman, draftsperson]

Moby Thesaurus II by Grady Ward, 1.0:

347 Moby Thesaurus words for "draughtsman":
   CD, IOU, MO, abbreviation, abbreviature, abrege, abridgment,
   abstract, acceptance, acceptance bill, air current, arrangement,
   article, attraction, autograph, bag, bang, bank acceptance,
   bank check, beverage, bill, bill of draft, bill of exchange,
   black and white, blackmail, blank check, blueprint, booster,
   booster dose, booster shot, boot, brainchild, brief, brouillon,
   bumper, call, call for, call-up, capsule, cartoon, certificate,
   certificate of deposit, certified check, charcoal,
   charcoal drawing, chart, check, checkbook, cheque, chiaroscuro,
   claim, commercial paper, compend, composition,
   compulsory military service, computer printout, condensation,
   condensed version, conscript, conscription, conspectus,
   contribution, copy, crayon, crosscurrent, current, current of air,
   debenture, deck, delineation, demand, demand bill, demand draft,
   demand for, design, diagram, digest, displacement, document,
   doodle, dose, downdraft, draft, draft call, drafted man, draftee,
   drafting, drag, drain, dram, draw, drawing, drayage, drench, drink,
   drop, dropping, drug packet, due bill, duty, ebauche,
   edited version, edition, elevation, engrossment, enlistee,
   enlistment, enrollee, enrollment, epitome, esquisse, essay,
   exaction, exchequer bill, extortion, extortionate demand,
   extraction, fair copy, fall wind, fiction, figure, final draft,
   finished version, first draft, fix, flimsy, flow of air,
   following wind, gargle, graph, ground plan, gulp, guzzle, haul,
   haulage, hauling, head, head wind, heave, heaving, heavy demand,
   hit, holograph, house plan, hymnal, hymnbook, ichnography,
   imposition, impost, impressment, indent, indraft, inductee,
   induction, inflow, inhalation, injection, inrush, insistent demand,
   inspiration, instrumental score, jetstream, jigger, jolt,
   katabatic wind, lap, letter, letter of credit, levy, libation,
   libretto, line drawing, literae scriptae, literary artefact,
   literary production, literature, lucubration, lug, lute tablature,
   mainlining, manuscript, matter, mobilization, money order, monsoon,
   movement of air, music, music paper, music roll, musical notation,
   musical score, muster, narcotic shot, negotiable instrument, nip,
   nonfiction, nonnegotiable demand, notation, note, note of hand,
   notice, opera, opera score, opus, orchestral score, order,
   original, outline, overdose, overview, pandect, paper, parchment,
   part, pastel, pattern, peg, pen-and-ink, pencil drawing, penscript,
   piano score, piece, piece of writing, play, plot, poem, popping,
   portion, postal order, potation, potion, precis, press,
   printed matter, printout, production, profile, projection,
   promissory note, pull, pulling, pulling power, quaff, raw recruit,
   reading matter, recension, recruit, recruiting, recruitment,
   requirement, requisition, review, rookie, rough, rough copy,
   rough draft, rough outline, round, round of drinks, rubric, rush,
   rush order, score, screed, scrip, script, scrive, scroll, selectee,
   selective service, sheet music, short score, shortened version,
   shot, sight bill, sight draft, silhouette, silver-print drawing,
   sinkage, sinopia, sip, skeleton, sketch, skin-popping, slurp,
   snifter, snort, songbook, songster, spot, strain, stream,
   stream of air, study, submergence, submersion, suck, summons, sup,
   survey, swig, swill, syllabus, synopsis, tablature, table,
   tail wind, tax, taxing, tenderfoot, text, the written word,
   thumbnail sketch, time bill, time draft, topical outline, tot,
   towage, towing, tracing, traction, tractive power,
   trade acceptance, trainee, transcript, transcription,
   treasury bill, tribute, tug, tug-of-war, tugging, typescript,
   ultimatum, undercurrent, updraft, version, vignette, vocal score,
   voucher, warning, warrant, wet, wind, work, working drawing,
   writing, written music