As I have understood Java in my last 7 years of experience Magic Words are deprecated reserved (key) words.

Why do we call it as Magic Word is that reserved is no more in the language but still compilers recognises it.

For example.
If you take goto const reserved words in Java these two are no more but compiler recognises why because VM should run the old code. That is it is there with VM. So that soft of words are called Magic Words .

Regards
-Narasimha Rao Konjeti.

A reserved word sometimes called a magic word is a word which in some computer programming language cannot be used as an identifier because it is already used for some grammatical purpose. For instance in SQL a user cannot be called 'group' because the word 'group' is used to indicate that an identifier refers to a group not a user. Such a word is a keyword it is because its use is restricted that it is also a reserved word.

Sometimes the specification for a programming language will have reserved words that are intended for possible use in future versions. In Java const and goto are reserved words they have no meaning in Java but they also cannot be used as identifiers. By reserving the terms they can be implemented in future versions of Java without breaking older Java source code