Sword originally had the W pronounced. Some people still pronounce the w, or hint at it slightly, but most leave it out because it's easier to say it without.
The silent letter in "sword" is the "w". It is not pronounced when saying the word.
Answer is the obvious answer! Another word is sword.
The W is silent in sword, pronounced "sord" (same as the word "soared").
The phonetic pronunciation of "sword" is ˈsȯrd. This word is pronounced with a silent "w" sound.
The word "sword" is pronounced as /sôrd/. The "w" is silent, so it is pronounced as if it were spelled "sord."
W
Sword
The silent letter is K. k-n-o-t is pronounced not.
The 'w' is silent in the word "answer".
The W is silent; wrong is pronounced 'rong'.
sword
The 'w' is silent.