Alterants are substances that change or modify the effects of other substances. Different synonyms can be used to describe them depending on the context. For instance, modifiers, adjusters, change agents, and influencers are all synonyms for alterants. Modifiers are substances that change the properties of other substances, while adjusters are substances that adjust or regulate the effects of other substances. Change agents, on the other hand, are substances that cause changes in patterns or behaviors. Lastly, influencers are substances that influence or affect other substances. All these synonyms are used to describe substances that have an impact on the effects of other substances.