"Bouch" is not a word recognized in the English language, so there are no synonyms available. However, assuming the word being referred to was meant to be "bouche," some possible synonyms could include "mouth," "maw," "oral cavity," "chops," or "jabberjaw." Each of these words could be used in situations where "bouche" might have been intended, such as in a description of a character's speech or appetite. It is important to note that using synonyms effectively means choosing words that are relevant and appropriate given the context in which they are being used.