Etiquette and Social code

Etiquette noun - Personal conduct or behavior as evaluated by an accepted standard of appropriateness for a social or professional setting.

Social code and etiquette are semantically related In some cases you can use "Social code" instead a noun "Etiquette".

Etiquette and social code are semantically related in expected behavior topic. You can use "Etiquette" instead a noun phrase "Social code", if it concerns topics such as rules of conduct and behavior.