Answer:
Take one royal word in the plural and make it singular by adding one letter
How many bricks does it take to complete a building made of brick?
Up on high I wave away but not a word can I say.
What has thousands of ribs and two backbones?
My second is performed by my first, and it is thought a thief by the marks of my whole might be caught.
What is big and yellow and comes in the morning, to brighten mom's day?