Etiquette and Ruling class

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

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

Ruling class noun - The class of people exerting power or authority.

Etiquette and ruling class are semantically related in sophistication topic. Sometimes you can use "Etiquette" instead a noun phrase "Ruling class".