a substance added to soaps or detergents to increase their cleansing action
"The laundry detergent bottle lists an enzyme as the builder that helps remove stubborn stains from my clothes."
someone who contracts for and supervises construction (as of a building)
"The builder arrived on site to inspect the foundation before allowing any more work to begin."
A person who builds or constructs things.
"The local builder arrived on site early to begin erecting the new garage walls."
In plain English: A builder is someone who constructs buildings and other structures by using tools and materials.
"The new builder finished constructing the house in just six months."
Usage: Use "builder" to describe a skilled professional who constructs buildings or other structures, such as a home builder. Do not use it to refer to someone who simply puts together furniture without formal training.
The word "builder" comes from the Middle English verb bylden combined with the suffix -er. It originally referred to someone who constructs buildings and has traveled into modern English through this direct lineage.