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

I am not a bull but I have horns.
I am not an ass but I have a pack saddle.
Wherever I go, I leave silver behind me.

Who am I?

I am quite hot but become too cold if you remove the first two letters. What am I?

If eleven plus two equals one, what does nine plus five equal?

You can find some missing letters in the picture. By placing two particular letters in the spaces, you can form a nine lettered word beginning from one of the corners and going clockwise direction to the middle. Can you find out the letters and the word?

Can you figure out the logic I used to decide the order of the following words:
gun, shoe, spree, door, hive, kicks, heaven, gate, line, den

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

A man fell off a smuggling boat into deep water. He could not swim and he was not wearing anything to keep him afloat. It took 30 minutes for the people on the boat to realize someone was missing. The missing man was rescued two hours later on the return trip. Why didn't he drown? Note:- He didn't know swimming, the sea was deep, and He wasn't holding anything

Which is the rope you never skip with?