The difference between Crow's nest and Mast
When used as nouns, crow's nest means a small open-top shelter, originally a cask, on the top of the foremast, large enough to accommodate a lookout. it was used by whalers to watch for a blow (spout), or in icebound waters to seek a channel, whereas mast means a tall, slim post or tower, usually tapering upward, used to support, for example, the sails on a ship, flags, floodlights, or communications equipment such as an aerial, usually supported by guy-wires.
Mast is also verb with the meaning: to supply and fit a mast to a ship.
check bellow for the other definitions of Crow's nest and Mast
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Crow's nest as a noun (nautical):
A small open-top shelter, originally a cask, on the top of the foremast, large enough to accommodate a lookout. It was used by whalers to watch for a blow (spout), or in icebound waters to seek a channel.
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Mast as a noun:
A tall, slim post or tower, usually tapering upward, used to support, for example, the sails on a ship, flags, floodlights, or communications equipment such as an aerial, usually supported by guy-wires.
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Mast as a noun (naval):
A non-judicial punishment ("NJP") disciplinary hearing under which a commanding officer studies and disposes of cases involving those under his command.
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Mast as a verb:
To supply and fit a mast to a ship
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Mast as a noun:
The fruit of forest-trees (beech, oak, chestnut, pecan, etc.), especially if having fallen from the tree, used as fodder for pigs and other animals.
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Mast as a verb (of swine and other animals):
To feed on forest seed or fruit.
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Mast as a verb (agriculture, forestry, ecology, of a population of plants):
To vary fruit and seed production in multi-year cycles.