witch, which, wich

The words witch, which, wich sound the same but have different meanings and spellings. Why do witch, which, wich sound the same even though they are completely different words?

The answer is simple: witch, which, wich are homophones of the English language.

which
  1. :: pronoun

    What particular one or ones: Which of these is yours?

  2. :: pronoun

    The one or ones previously mentioned or implied, specifically:

  3. :: pronoun

    Used as a relative pronoun in a clause that provides additional information about the antecedent: my house, which is small and old.

  4. :: pronoun

    What particular one or ones: Which of these is yours?

wich
  1. :: noun

    A bundle of thread. Alternative spelling of wick.

witch
  1. :: noun

    A woman claiming or popularly believed to possess magical powers and practice sorcery.

  2. :: noun

    A believer or follower of Wicca; a Wiccan.

  3. :: noun

    A hag.

  4. :: noun

    A woman considered to be spiteful or overbearing.

Definitions from The American Heritage® Dictionary of the English Language, 4th Edition, from Wiktionary, Creative Commons Attribution/Share-Alike License and Wordnik.

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About Homophones

Homophones (literally "same sound") are usually defined as words that share the same pronunciation, regardless of how they are spelled.

If they are spelled the same then they are also homographs (and homonyms); if they are spelled differently then they are also heterographs (literally "different writing").