radicle, radical

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

The answer is simple: radicle, radical are homophones of the English language.

radical
  1. :: adjective

    Arising from or going to a root or source; basic: proposed a radical solution to the problem.

  2. :: adjective

    Departing markedly from the usual or customary; extreme: radical opinions on education.

  3. :: adjective

    Favoring or effecting fundamental or revolutionary changes in current practices, conditions, or institutions: radical political views.

  4. :: adjective

    Linguistics Of or being a root: a radical form.

radicle
  1. :: noun

    Botany The part of a plant embryo that develops into a root.

  2. :: noun

    Anatomy A small structure, such as a fibril of a nerve, that resembles a root.

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").