請問一下push為什麼既可以當動詞也可以當名詞?

我學英文從一剛開始就學的很奇怪了,

因為push本身就是可以當動詞,也可以當名詞

如果我用英文表達說

Push box is difficult to me
Because Push box is like puzzle game


Pushing box is difficult to me
Because Pushing box is like puzzle game

既然這兩格都有名詞,可是這兩個差別到底出在哪裡?
誰可以跟我說明一下為什麼嗎?
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