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

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?

I taste better than I can smell. Who am I?

Let's play a word game. Following are some meaningless words that can be completed by adding random letters on either side of the word.

For example, the word "rdo" can be formed into "pardon".

Using the same technique, can you complete the given words?
ecalc
airb
rinci
tibac
uidel
gorit
igna
eyho

John leaves home and then he takes three right turns. John wants to return to home but he was scared of Jacob, who is wearing a mask.

What is John Situation ?

What runs around the whole yard without moving?

How can you leave a room with two legs and return with six legs?

What goes up but never comes down?

There is something which is always coming but never arrives?

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