So a mole is a form of construction (massive structure of masonry) which
can have various functions (serving as a PIER or BREAKWATER, or both).

On 2016-02-17 15:18, Malcolm Herring wrote:

> From the IHO Hydrographic dictionary:
> 
> breakwater. A structure protecting a shore area, HARBOUR, ANCHORAGE, or BASIN 
> from WAVES. See also FLOATING BREAKWATER.
> 
> jetty. In U.S. terminology, a structure, such as a WHARF or PIER, so located 
> as to influence CURRENT or protect the ENTRANCE to a HARBOUR or RIVER.
> In British terminology, a PIER, usually of solid construction, intended as a 
> berthing place for vessels. See DOCK, LANDING, WHARF.
> 
> mole. A massive structure of masonry or large stones serving as a PIER or 
> BREAKWATER, or both.
> 
> pier. A long, narrow structure extending into the water to afford a berthing 
> place for vessels, to serve as a promenade, etc. See also JETTY.
> 
> quay. A WHARF approximately parallel to the SHORELINE and accommodating ships 
> on one side only, the other side being attached to the SHORE. It is usually 
> of solid construction, as contrasted with the open pile construction usually 
> used for PIERS
> 
> wharf. A structure serving as a berthing place for vessels.
> 
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