• ryal dors,
• roayl doors,
• riyal doors,
• royel doors,
• royle doors,
• royaal doors,
• royal doores,
• royal ddoors,
• royl doors

The adjective form of the phrase "royal doors" is "royal".

The plural form of the word "royal doors" is "royal doors." The word does not change in its plural form.

The singular form of the word "royal doors" is "royal door".