Spoiling tactic is a term used to describe a strategy employed by an individual or group to sabotage or undermine the plans of others. There are several words that can be used as synonyms for spoiling tactics, including disruption, interference, subversion, obstruction, and undercutting. Disruption refers to interrupting or breaking apart something that is going smoothly. Interference refers to meddling or intervening in a situation that does not concern oneself. Subversion refers to undermining authority or destabilizing a system. Obstruction refers to hindering or preventing progress or movement. Undercutting refers to undermining or reducing the value or effectiveness of something. All of these words capture the essence of spoiling tactics and can be used interchangeably depending on the context.