chock, choc

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

The answer is simple: chock, choc are homophones of the English language.

choc
  1. :: noun

    short form of chocolate (the food or an individual piece of confectionery)

chock
  1. :: noun

    A block or wedge placed under something else, such as a wheel, to keep it from moving.

  2. :: noun

    Nautical A heavy fitting of metal or wood with two jaws curving inward, through which a rope or cable may be run.

  3. :: verb-transitive

    To fit with or secure by a chock: The plane's wheels were chocked and chained down.

  4. :: verb-transitive

    Nautical To place (a boat) on chocks.

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