In the phrase 'you are', the verb 'are' is in the second person and the word 'you' is a second-person pronoun.

在短语you are中，动词are是第二人称形式，而单词you是第二人称代词。

《牛津词典》

In the sentence, 'I sent her a postcard', the word 'her' is in the dative.

在I sent her a postcard一句中，her一词处于与格。

《牛津词典》

There is a similar word in many languages, for example in French and Italian.

许多语言，譬如法语和意大利语，都有相似的词。

《牛津词典》

University of Notre Dame anthropology professor Susan Blum wrote about this in a new book, "My Word! Plagiarism and College Culture."

VOA: special.2009.04.23

By the way, in what I'm saying, I oversimplify by supposing that the basic unit of language is a word.

因为我想说的是，我们现在是把语言的基本单位简单化了。

耶鲁公开课 - 文学理论导论课程节选

It is an electron beam. In the 1890s, the latter part of the 19th century a very fashionable word was "ray."

那是个电子束，在十九世纪九十年代，就是19世纪末,一个很时髦的词汇-“光线“

麻省理工公开课 - 固态化学导论课程节选

After Li's eldest son Victor was kidnapped by notorious gangster Cheung Chi-keung in 1996, the tycoon was said to have put in a word at top levels in Beijing. (Li himself brushed off the suggestion.) Mainland police caught Cheung, put him on trial and executed him.

CNN: Up, Up And Away

But for me, as the CEO of a marketing idea company, my first reaction in hearing about this idea was, in a word, visceral.

FORBES: Beck 'Sheet Music' Article Stirs Controversy Over What Innovation Is

Their spin is that Bo and his wife were mixed up in dodgy deals that ended in the murder of a British businessman - that they were, in a word, corrupt.

BBC: A Point of View: Lords, lordlings and�� crumpets