Iliacus is a term that refers to a muscle located in the pelvic region of the human body. This muscle helps to support the lower back and improve posture. While there aren't many different words that can be used as synonyms for iliucus, there are some related terms that can help to give a more in-depth understanding of this muscle. These terms include psoas muscle, hip flexor, and iliac muscle. Each of these words relates to the iliucus by either describing its location or its function within the body. Understanding these related terms can help to deepen one's knowledge of the iliucus and the role it plays in overall health and wellbeing.