The phrase "not singular" has different synonyms, depending on the context of use. In mathematics, it may mean plural or multiple, while in grammar, it can refer to words such as "several," "various," and "many." Other relevant synonyms include "pluralistic," "inclusive," and "diverse," which imply that there are multiple perspectives, individuals, or groups involved. Additionally, in some contexts, "not singular" may be interchangeable with "complex," "complicated," or "multifaceted," indicating that there are many factors or layers to consider. Overall, the choice of synonyms for "not singular" will depend on the intended meaning and the specific situation in which it is used.