builder

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun One that builds, especially a person who contracts for and supervises the construction of a building.
• noun An abrasive or filler used in a soap or detergent.

from The Century Dictionary.

• noun One who builds, or whose occupation is that of building; specifically, one who controls or directs the work of construction in any capacity.

from the GNU version of the Collaborative International Dictionary of English.

• noun One who builds; one whose occupation is to build, as a carpenter, a shipwright, or a mason.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A person who builds or constructs things.
• noun rare, bodybuilding A bodybuilder.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun someone who contracts for and supervises construction (as of a building)
• noun a substance added to soaps or detergents to increase their cleansing action
• noun a person who creates a business or who organizes and develops a country