Oil rig is a term that refers to a large structure located on land or water that is used for drilling an oil well and extracting oil or gas. There are several synonyms for oil rig that can be used interchangeably depending on the context. Some of the commonly used synonyms for oil rig include drilling rig, oil platform, offshore rig, jack-up rig, well drilling rig, drillship, platform rig, and semi-submersible rig. Each of these terms describes a specific type of oil rig used for drilling, such as offshore rig that is located far from the shore and drilling rig used for drilling wells on the land.