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

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?

A man in a car saw a Golden Door, Silver Door and a Bronze Door. What door did he open first?

I have eight fingers and two thumbs but I do not live. What Am I?

I am the black child of a white father, a wingless bird, flying even to the clouds of heaven. I give birth to tears of mourning in pupils that meet me, even though there is no cause for grief, and at once on my birth, I am dissolved into air. What am I?

What can you catch but never throw?

There is something which is always coming but never arrives?

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

What English word has three consecutive double letters?

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?