High Church is a term that refers to a branch of Protestantism that emphasizes formal liturgy, sacraments, and hierarchical structures. Some common synonyms for this term include Anglo-Catholic, Ritualist, or Traditionalist. Some members of this branch of Protestantism might also be referred to as "high-churchmen" or "high-churchwomen." This term is often contrasted with the term "Low Church," which refers to a more informal, evangelical approach to Protestantism. However, it's worth noting that these terms can mean different things in different contexts and might not always be used consistently. Other potential synonyms for High Church could include terms like "sacerdotalist," "catholic-minded," or "liturgical".