A synonym for "rerelease" could be "reissue", which means to release something again for sale or distribution. Another possible synonym is "reprint", which refers to the act of printing a previously published work again. "Republish" is also a synonym, indicating the act of making something previously published available to the public again. "Rebroadcast" is another option, meaning to air a previously broadcasted show or event again. "Reproduce" can also be considered a synonym, as it refers to making a copy or replica of something. All of these synonyms share a common theme of releasing or making something previously published or broadcasted available once again.