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]