Answer:
I start in little but I end in full, you'll find me in half and complete.
It has the biggest wall and is also used when drinking tea.
Take one royal word in the plural and make it singular by adding one letter
A sphere has three, a circle has two, and a point has zero. What is it?
Noah survived one and it was great
All about, but cannot be seen, Can be captured, cannot be held, No throat, but can be heard. Who am I?