"Musts" refer to things or actions that are necessary or required. There exist several synonyms for this term that can be used interchangeably in various contexts. For instance, the term "essentials" implies crucial items or fundamental principles that cannot be overlooked. "Imperatives" denote commands, rules, or duties that are mandatory or critical. "Necessities" refer to basic requirements or provisions that are crucial for survival or everyday life. "Obligations" denote duties or responsibilities that one must undertake or fulfill. Lastly, "requisites" imply essential qualifications, conditions or skills that one must possess or meet. In conclusion, these synonyms can be used in place of "musts" to express mandatory actions or necessities.