The term "royal paper" can refer to a variety of different paper types and qualities. Some synonyms for royal paper include high-quality, premium, luxury, upscale, and superior paper. Other synonyms could include fancy paper, prestige paper, or elite paper. The term may also refer specifically to papers used for official documents or correspondence, such as letterhead paper or stationery. No matter which synonym is used, the implication is that the paper is of exceptional quality and is often used for important or prestigious purposes.