The word "muat" does not exist in English language. However, if the intended word is "must", some commonly used synonyms for it include "have to", "need to", "should", "ought to", and "required". These words are often used interchangeably in a sentence to replace the primary verb "must" in order to convey the same meaning or message. It is important to remember that although they may seem similar, each synonym carries a slightly different connotation and should be chosen accordingly based on the context of the sentence and the intended tone or emphasis.