Allergens refer to substances that cause an allergic reaction in the body. There are numerous synonyms for the word allergens such as antigens, irritants, triggers, sensitizers, and agitators. Antigens are foreign substances that enter the body causing the immune system to react. Irritants refer to substances that cause irritation in the body. Triggers are anything that can activate an allergic reaction, while sensitizers refer to substances that trigger an allergic reaction after repeated exposure. Agitators refer to substances that cause inflammation in the body, leading to an allergic reaction. Understanding the synonyms of the word allergens is essential to identify and avoid exposure to substances that can cause an allergic reaction.