RUC, which stands for Royal Ulster Constabulary, is a law enforcement agency that used to operate in Northern Ireland. Synonyms for RUC can be related to its function as a police force, such as law enforcement agency, police department, or police force. Other synonyms can be related to its specific location in Northern Ireland, including Northern Ireland police or Ulster police. Additionally, words such as peacekeeping force, security force, or public security may also be used as synonyms for RUC. Overall, the synonyms for RUC focus on its role in maintaining law and order in Northern Ireland and its relationship to the local population.