词性是名词，nights，意思是夜、晚上，例如：

1、We took a room at the hotel for two nights.我们在旅馆开了个房间，住了两夜。

2、The nights are getting longer.夜越来越长。

3、What time did you get back last night?你昨晚什么时候回家的

4、What time did you get home last night?你昨晚什么时间到家的