word做訊息資訊時可數嗎

例句：

The appropriate word eluded him.

他想不起來那個合適的詞。

What's the meaning of this word?

這個單詞的`意思是什麼？

The first word begins with an F.

第一個詞以F開頭。

It's not a word in common usage.

這不是一個常用詞。

I didn't believe a word she said.

她說的話我一句都不信。