Two by fours are a commonly used building material in construction projects, but there are a host of other synonyms that can be used instead. Some alternatives include 2x4s, construction lumber, framing lumber, and dimensional lumber. These terms all refer to wood boards that measure approximately two inches thick by four inches wide. Other options may include pine studs or spruce lumber. Ultimately, the specific type of wood and measurement will depend on the project at hand and the preferences of the builder. Regardless of the term used, these types of wood boards are essential for many building projects and are readily available at hardware stores and lumber yards.