There are not many synonyms for the word "Iscariotism" as it is a term referring to the betrayal of Jesus Christ by Judas Iscariot in the Bible. However, some similar words include treachery, betrayal, disloyalty, deception, and deceit. These words all describe actions or behaviors that involve breaking trust or loyalty, which is similar to the act of Judas betraying Jesus. Although these words may not be interchangeable with "Iscariotism," they can be used in similar contexts to describe acts of betrayal or disloyalty in various situations.