The verb construct refers to the act of constructing, whereas the noun construction refers to the way something is created and the type of its structure.
Construction, in its broadest sense, refers to the processes involved in constructing buildings, infrastructure (such as roads, bridges, tunnels, and dams), industrial facilities, and related operations from conception to completion. Construction normally begins with planning, finance, and design and continues until the asset is finished and ready for use; it also includes repairs and maintenance, any expansion, extension, or improvement work, and the asset’s final deconstruction, dismantling, or decommissioning.