The difference between Quay and Riprap
When used as nouns, quay means a stone or concrete structure on navigable water used for loading and unloading vessels, whereas riprap means an underwater bank seen as a danger to shipping.
When used as verbs, quay means to land or tie up at a quay or similar structure, especially used in the phrase "quay up", whereas riprap means to form a riprap in or upon.
check bellow for the other definitions of Quay and Riprap
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Quay as a noun (nautical):
A stone or concrete structure on navigable water used for loading and unloading vessels; a wharf.
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Quay as a verb:
To land or tie up at a quay or similar structure, especially used in the phrase "quay up".
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Riprap as a noun:
An underwater bank seen as a danger to shipping.
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Riprap as a noun (chiefly, _, North America):
Rocks or other materials used to shore up an embankment, deter or prevent erosion, guide shipping, or serve as a temporary mooring.
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Riprap as a verb:
To form a riprap in or upon.