The COBOL word can be formed by using the characters as shown below:
A-Z (a-z) - (hyphen)
The rules below should be hold in forming the COBOL words.
(1) A word cannot start or end with a hyphen.
(2) A word can have at the utmost 30 characters.
(3) One of the characters should be a letter. Some compilers put the additional restrictions which the first character should be a letter.
(4) Except hyphen (-) no special character allowed.