Wring
The 'w' is silent.
W
The word "yolk" is pronounced "/yōk/" so it has an silent l since its not pronounced.
I think you mean the which letter is silent in the word 'wrong'. And the answer to that is the letter 'w'.
Yawn
The 'w' is silent in the word "answer".
The W is silent; wrong is pronounced 'rong'.
The 'w' is silent.
wrap
The 'w' is silent in the word wrong.
The silent letter in the word "wrote" is the silent W.
W
The silent consonant in the word "whole" is the "w."
The letter 'w' is silent in the word 'whole'.
The silent letter in "sword" is the "w". It is not pronounced when saying the word.
The word "yolk" is pronounced "/yōk/" so it has an silent l since its not pronounced.
The silent word in "dwarf" is the "w." It is pronounced as "dor-f."