It's a noun, groups of people or things that are similar in some way.

这是一个名词，是指在某些方面相似的人或事物的群体。

I'm sorry to see them go. - Not as sorry as Mary. - What's a group noun for suitors?

他们走了我真难过 -谁也没玛丽难过多个追求者要用什么量词形容？

A four syllable word with first syllable stress with  that AA vowel there: caa-- caa-- cate-- cate-- categories. Categories. It's a noun, groups of  people or things that are similar in some way.

一个四音节单词， 第一个音节重音带有 AA 元音：caa-- caa-- cate-- cate-- categories。类别。 它是一个名词， 在某种程度上相似的一群人或事物。