Hypersensitivity is a medical term that refers to an exaggerated response by the immune system to a particular substance or stimulus. Some synonyms for hypersensitivity include allergy, sensibility, reactivity, susceptibility, and intolerance. Allergy specifically refers to an immune response to a specific substance or allergen, while sensibility refers to a heightened awareness or sensitivity to a particular stimulus. Reactivity and susceptibility both imply an exaggerated response to a particular substance or event, while intolerance suggests that the body is unable to tolerate or handle exposure to a particular substance. Overall, these synonyms help to describe the range of responses that can be present in individuals with hypersensitivity.