Essential, binding, and compulsory are all synonyms for mandatory. Optional and voluntary. are antonyms of mandatory. And here are 11 another word for mandatory.
Binding, compulsory, essential, inescapable, necessary, obligatory, required, requisite, unavoidable, and imperative are all synonyms for mandatory.
Mandatory synonym page has a variety of synonyms that differ in length. 1 synonym with 7, and 8 letters and 3 synonyms with 9 letters. 2 synonyms with 10, and 11 letters. For a total of 9 another word for mandatory.
Attendance at the event is optional.
Wearing a tie is entirely optional.
The extra credit assignment is optional.
The class offers optional weekend sessions.
Dessert after dinner is always optional.