"Catamenial" is a term used to describe anything that is related to a woman's menstrual cycle. However, there are a number of synonyms that can be used in its place. Firstly, "menstrual" is the most commonly used synonym and refers directly to the process of menstruation. Other alternatives include "cyclic", "monthly", and "periodic". Given the association with the lunar cycle, "lunar" can be used as a poetic synonym for "catamenial". Additionally, terms that are more specific to the symptoms of menstruation, such as "crampy", "bloody", or "painful", could also be used in context to replace "catamenial".