The silent letter in "sword" is the "w". It is not pronounced when saying the word.
W
The W is silent in sword, pronounced "sord" (same as the word "soared").
Sword
One example is "sword." The "w" is silent in this word, which is pronounced as "sord."
The phonetic pronunciation of "sword" is ˈsȯrd. This word is pronounced with a silent "w" sound.
sword
The word "sword" is pronounced as /sôrd/. The "w" is silent, so it is pronounced as if it were spelled "sord."
The "w" in "sword" is silent because it is a historical spelling that has been retained over time. In Old English, the word was pronounced with the "w" sound, but it eventually dropped out of usage while the spelling remained the same.
The silent letter is K. k-n-o-t is pronounced not.
In English, the letter "w" can sometimes be silent in words borrowed from other languages, like "sword" or "answer". Similarly, in some dialects or accents, the "w" in words like "wreck" or "write" may be pronounced more softly or skipped altogether.
The first 'w' is silent.