entrance, entrants

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

The answer is simple: entrance, entrants are homophones of the English language.

entrance
  1. :: verb-transitive

    To fill with delight, wonder, or enchantment: a child who was entranced by a fairy tale. See Synonyms at charm, enrapture.

  2. :: verb-transitive

    To put into a trance.

  3. :: noun

    Nautical The immersed part of a ship's hull forward of the middle body.

  4. :: noun

    The first entry of an actor into a scene.

entrants
  1. :: noun

    Plural form of entrant.

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").