Jetty
Part of speech: noun
Definition: A part of a building that jets or projects beyond the rest, and overhangs the wall below. A wharf or pier extending from the shore. (Hydraulic engineering): A structure of wood or stone extended into the sea to influence the current or tide, or to protect a harbor; a mole; as, the Eads system of jetties at the mouth of the Mississippi River.
Part of speech: verb
Definition: To jut out; to project.
Part of speech: adjective
Definition: Made of jet, or like jet in color.
Pier
Part of speech: noun
Definition: A raised platform built from the shore out over water, supported on piles; used to secure, or provide access to shipping; a jetty.A similar structure, especially at a seaside resort, used to provide entertainment.A structure that projects tangentially from the shoreline to accommodate ships; often double-sided.A structure supporting the junction between two spans of a bridge.A rectangular pillar, or similar structure, that supports an arch, wall or roof.