The Collaborative International Dictionary of English v.0.48:

Builder \Build"er\, n.
   One who builds; one whose occupation is to build, as a
   carpenter, a shipwright, or a mason.
   [1913 Webster]

         In the practice of civil architecture, the builder
         comes between the architect who designs the work and
         the artisans who execute it.             --Eng. Cyc.
   [1913 Webster]

WordNet (r) 3.0 (2006):

builder
    n 1: a substance added to soaps or detergents to increase their
         cleansing action [syn: builder, detergent builder]
    2: a person who creates a business or who organizes and develops
       a country; "empire builder"
    3: someone who contracts for and supervises construction (as of
       a building) [syn: builder, constructor]

Moby Thesaurus II by Grady Ward, 1.0:

95 Moby Thesaurus words for "builder":
   ancestors, apprentice, architect, artificer, artist, author,
   barber, beautician, begetter, beginner, brazier, bricklayer,
   cabinetmaker, carpenter, carver, chandler, conceiver, constructor,
   contractor, cooper, craftsman, creator, designer, deviser,
   discoverer, effector, electrician, engenderer, engineer, executor,
   executrix, farmhand, father, fitter, forger, founder, fuller,
   gas fitter, generator, glassblower, glazer, glazier, grower,
   hairdresser, inaugurator, industrialist, initiator, instigator,
   institutor, introducer, inventor, journeyman, lather, machinist,
   maker, manicurist, manufacturer, mason, master, master craftsman,
   mechanic, miller, mother, organizer, originator, past master,
   planner, plumber, potter, precursor, prime mover, producer,
   puttier, raiser, realizer, rigger, roofer, saddler, shaper, sire,
   smith, spinner, steeplejack, stonecutter, stonemason, tanner,
   tinker, tinner, turner, upholsterer, weaver, welder, woodcutter,
   wrecker, wright