What is the Difference Between a Port, Quay, Pier and Wharf?

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What is the Difference Between a Port, Quay, Pier
and Wharf?
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These terms are sometimes used interchangeably,
but there are differences between each which it
is useful to remember.

• A Port is generally a description of a place on
  the coast which has facilities for boats or ships
  to call into, and usually a village or town
  attached. Normally these places developed because
  the natural features at that particular part of
  the coastline (a break in the high cliffs, an
  area of deep-water where the coast is rocky
  etc.). Because a port is a description of a type
  of function, ports can look very different from
  one. 

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• A Wharf is a man-made structure on a river or by
  the sea, which provides an area for ships to
  safely dock. Some are very intricate, with
  multiple types of berth over a large area, and
  navigable channels, and others are more
  straightforward. A Wharf can contain quays and
  piers and will normally have buildings within it
  to service the ships (often warehouses and
  offices). Because of their abundance of unusual
  buildings and ready-made water features, unused
  wharfs are often converted into expensive retail
  and housing areas (for instance Canary Wharf and
  Butler's Wharf in London).

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• A Quay is, technically, a part of the river bank
  or coastline which has been modified so ships can
  dock at it parallel to the shore. This boat is
  moored at the quay in Poole, England. 
• A Pier is a, normally wooden, structure which
  protrudes from the shore at a level above the
  water level, allowing ships to disembark
  passengers in the deeper water further out. The
  length of the pier may also provide berths for
  smaller boats.

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Sources

• Article Source www.theshippinglawblog.com
• Image Source brookandbyrne.com.au