A plagal cadence is a musical term that describes a harmonic progression commonly found in hymns and religious music. However, there are several synonyms and related terms that can be used to describe this type of cadence. Some of these include the "Amen cadence," "the Church cadence," and the "Final cadence." Additionally, the plagal cadence can be referred to as a "IV-I" or "four-one" cadence, as it involves a chord progression from the subdominant to the tonic. Understanding these related terms can help musicians and music students better understand and analyze the use of plagal cadences in various musical compositions.