root, route

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

The answer is simple: root, route are homophones of the English language.

root
  1. :: noun

    The usually underground portion of a plant that lacks buds, leaves, or nodes and serves as support, draws minerals and water from the surrounding soil, and sometimes stores food.

  2. :: noun

    Any of various other underground plant parts, especially an underground stem such as a rhizome, corm, or tuber.

  3. :: noun

    The embedded part of an organ or structure such as a hair, tooth, or nerve, that serves as a base or support.

  4. :: noun

    A base or support: We snipped the wires at the roots.

route
  1. :: noun

    A road, course, or way for travel from one place to another.

  2. :: noun

    A highway.

  3. :: noun

    A customary line of travel. See Synonyms at way.

  4. :: noun

    A fixed course or territory assigned to a salesperson or delivery person.

Definitions 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").