Declare Illegal is a term used to describe the act of making something illegal or forbidden by law. OUTLAW, which has 6 letters, is a term used to describe someone or something that is considered illegal or outside the law. FORBID, also with 6 letters, is a term used to describe an action that is not allowed or prohibited by law. Lastly, BAN, with 3 letters, is a term used to describe an official or legal prohibition of something. All of these terms are related to the phrase Declare Illegal, which is used to describe the act of making something illegal or forbidden by law.