The term "conk buster" can refer to anything that stops or prevents something from happening. Some related synonyms include "barrier," "obstacle," "roadblock," "hindrance," and "stumbling block." Another term often used is "showstopper," which refers to an event or situation that brings everything to a halt. Other options depending on context and tone may include "deal breaker," "halt," "cease," "knockdown," "overwhelm," and "preventer." The common thread between these synonyms is that they all describe something that is capable of halting progress or momentum in some way.