Answer:
Take one royal word in the plural and make it singular by adding one letter
What is something that can go up quite easily, but is not as easy to bring back down?
Where can you find roads without cars, forests without trees and cities without houses?
What instrument plays from the heart?
It carries paper of the most important sort but also plastic, I'm glad to report. What is it?
What language does a billboard speak?
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?