Difference between Excalibur and Excalibur

What is the difference between Excalibur and Excalibur?

Excalibur as a proper noun is a legendary sword of king arthur, attributed with magical properties. while Excalibur as a proper noun is a legendary sword of king arthur, attributed with magical properties.

We hope you now know whether to use Excalibur or Excalibur in your sentence.