I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

What is at the end of a rainbow?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

_ _ _ IE _ _
_ _ _ IE _
_ _ IE _ _
_ _ IE _
_ _ _ _ IE

Like you see, some letters have gone missing from these words that contain the IE pair at some or the other place. The letters that will be used to fill the blanks are given below. Use them and form meaningful words. Can you do that?

A, C, D, F, H, K, L, M, N, N, O, R, R, S, S, S, T, T, Y and Y.

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

There is something which is always coming but never arrives?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

It belongs to you, but other people use it more than you do. What is it?

Living above a star, I do not burn
Eleven friends and they do not turn
I can just be visited in a sequence, not once or repeatedly
PQRS are my initials
Can you tell my name accurately?