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Re: Yacht and Boat
A yacht is defined as a pleasure craft and in the US, it is commonly a luxury craft or one kept in exceptional condition, where you'd expect polished brightwork and perhaps a crew with blazers.
A ship is usually defined as a vessel over 100' overall length while a boat is under 100'. Boats are carried aboard ships (as in lifeboats) but not vice-versa.
And then there are "electric boats" as in submarines. A submarine is always a boat, even if it is a hundred meters long.
Some of the differences may be specified in code or regulations, others are traditional. And from a similar quesiton posted elsewhere this week, apparently the terms simply canot be translated into some other languages and contexts, like German, at all.