The w in sword is silent because English spelling often preserves older forms of words. Sword comes from Old English sweord, where the w was once pronounced. Over time, the pronunciation changed, and speakers stopped saying that sound clearly. The spelling, however, stayed close to the older form.
This happens in many English words. Spelling is not always a perfect map of modern speech. Sometimes it acts more like a record of earlier pronunciation.
- sword: the w is written, but not spoken
- answer: the w became silent here too
- two: the w remains in spelling, even though we say only the t sound followed by the vowel
So the silent w in sword is not random. It reflects the word’s history. English keeps many spellings that show where words came from, even when pronunciation moves on. That is one reason English can seem inconsistent, but it also means spelling sometimes gives us a glimpse of the past.