When searching for a must-have thingummy, it's always helpful to have a wide range of synonyms to use to broaden your options. A must-have thingummy can be referred to as an essential, indispensable, crucial, vital, or mandatory item. It may also be labeled as a necessity, requirement, requisite, or needful product. When shopping for a must-have thingummy, it's important to keep in mind its purpose and functionality to ensure that it aligns with your needs. By keeping these synonyms in mind, you will have a better chance of finding the perfect must-have thingummy to satisfy your requirements.