Question

pick out the nouns in the following passages and separate them into different kinds

The working of a submarine is very simple. On the surface, the submarine is like any other ship, except that it has tanks built around its hull. When the submarine wants to go under water, water is allowed to fill these tanks, making the ships heavy enough to sink. When the submarine wants to rise to the top of the water, water is pumped out of the tanks, making the ship light enough to rise.
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Answer 1

Submarine, ship, tanks and water that's the nouns