mustered, mustard

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

The answer is simple: mustered, mustard are homophones of the English language.

mustard
  1. :: noun

    A dark yellow to light olive brown.

  2. :: noun

    Any of various Eurasian plants of the genus Brassica, especially B. nigra and B. juncea, which are cultivated for their pungent seeds and edible leaves.

  3. :: noun

    A condiment made from the powdered seeds of certain of these plants.

  4. :: noun

    A member of the mustard family.

mustered
  1. :: verb

    Simple past tense and past participle of muster.

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").