我们通常用 "word poverty" 来表示 "词穷" 这个概念。这个词来源于 "语言贫困"，指的是某个人的语言能力有限，缺乏丰富的词汇。例如：

I feel like I have word poverty when I try to speak English.

Some children suffer from word poverty, which can hinder their ability to learn.

不过，我们通常不会用这个词来表示这个概念，而是会用 "limited vocabulary" 或 "lack of vocabulary" 来表达。例如：

My limited vocabulary makes it difficult for me to express myself in English.

One of the biggest challenges for language learners is the lack of vocabulary.

希望这些信息对你有帮助。