The collective nouns are a fleet of warships, an armada of
warships, a flotilla of warships.
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"Fleet" can be used for both warships and peaceable merchant
ships.
"Convoy" requires some warships, but may involve merchant ships
being protected by the warships.
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privately owned warships
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The warships make up a formidable defence front on sea for any
nation.They constitute a part of the fleet of warships such as
aircraft carriers,and different classes of warships including
mineswipers and submarines.