Organ manuals are a crucial part of playing the organ since they are the keyboards that control the sound production. When it comes to synonyms for the term "organ manual," there are a few to consider. The most common synonym is "keyboard," which is a term typically used in the context of pianos and similar instruments. Another synonym to consider is "clavier," a term that is specific to keyboard instruments that are played by hand. Other synonyms for organ manual include "manuals" and "keyboards," which both describe the physical components of the instrument that are used to play notes. Ultimately, the best synonym for organ manual is one that accurately conveys the meaning in the specific context in which it is used.