Immunodeficiency refers to a condition in which the immune system doesn't function properly, making the body vulnerable to infections. The term is often used interchangeably with other synonyms that convey similar meanings. One of these is "immune deficiency," which also implies an insufficiency in the body's defenses against harmful pathogens. "Immunosuppression" is another synonym, indicating a reduction in the activity of the immune system, often due to medication or disease. "Immunocompromised" is another term used to describe a weakened or compromised immune system. "Hypogammaglobulinemia" refers to low levels of antibodies in the blood, a type of immunodeficiency. Whatever term is used, it is important for individuals with immunodeficiencies to take appropriate precautions and seek medical advice.