What is another word for provocative agent?
Pronunciation: [pɹəvˈɒkətˌɪv ˈe͡ɪd͡ʒənt] (IPA) 
The term provocative agent refers to a substance, drug, or chemical that is known to cause a reaction or response in a biological system. However, there are various synonyms that can be used to describe this term, such as an irritant, stimulant, or instigator. Other related words that can be used include trigger, catalyst, stimulant, prompt, or exciter. These synonyms are often used interchangeably in science and medicine to describe substances that are capable of causing a reaction or response in living organisms. In essence, these agents are necessary for various processes such as immunization, allergy testing, and medical diagnosis.
