What word is pronounced the same if you take away four of its five letters?

Can anyone tell me a word in the English dictionary which has a silent 'z'?

If Rajina's daughter is my daughter's mom, who am I to Rajina?

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

Can you name some countries which do not have the alphabet 'A' in them?

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 always in front of you but can’t be seen?

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?

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?

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