The letter which is silent in the word folk is the letter L.
the letter -L-
The silent letter in the word "walk" is the letter "l."
the letter "L" is silent
The letter 'L' is silent in the word 'could'.
The "l" in "half" is silent.
The E in gentle is silent.
The letter T is silent.
In the word 'talk', 'l' is the silent letter.
The "l".
L
The 'l'