Answer:
Add a T and I shoot through the sky. Then add an S and I multiply. What word is it?
White bird, featherless, flying out of paradise. Flying over sea and land. Dying in my hand.
What tastes better than it smells?
A precious stone, as clear as diamond. Seek it out whilst the sun's near the horizon. Though you can walk on water with its power, Try to keep it, and it'll vanish within an hour.
Who makes it, has no need of it. Who buys it, has no use for it. Who uses it can neither see nor feel it. What is it?
What is so fragile that saying its name breaks it?