The term "pertaining to government affairs" can be easily substituted with various synonyms depending on the context and purpose of communication. Some commonly used synonyms include "political," "administrative," "governing," "regulatory," "official," "public," and "legislative." If referring to matters of the state and its internal or external policies, words such as "diplomatic," "international," and "foreign relations" may be used. Similarly, if discussing matters related to the judiciary, terms like "juridical" or "legal" might be utilized. When it comes to communication with the public, "civil," "municipal," and "civic" are suitable synonyms. Overall, the selection of synonyms for "pertaining to government affairs" will differ depending on the context and connotation required.