especial不是名词，是形容词。
例句
1、
The lecture will be of especial interest to history students.
学历史的学生会对这个讲座特别有兴趣。
2、
The authorities took especial interest in him because of his trade union work.
因为他在工会工作，官方对他特别感兴趣。
3、
This is a matter of especial importance.
这是一件特别重要的事情。
