Defensive proteins are crucial for an organism's immunity and protection against various diseases. They are produced by the body in response to infections or other threats. Synonyms for defensive protein include immunoglobulin, antibody, antitoxin, antiserum, serology, and immunology. These specialized proteins play a vital role in the body's immune system, helping to identify and eliminate foreign pathogens such as bacteria, viruses, and parasites. By recognizing specific antigens present on the surface of these invaders, defensive proteins neutralize them and prevent further harm to the body. Having these synonyms for defensive protein is important to better understand the importance and functions of these proteins in our body's defense mechanisms.