loop, loupe

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

The answer is simple: loop, loupe are homophones of the English language.

loop
  1. :: noun

    A length of line, thread, ribbon, or other thin material that is curved or doubled over making an opening.

  2. :: noun

    The opening formed by such a doubled line.

  3. :: noun

    Something having a shape, order, or path of motion that is circular or curved over on itself.

  4. :: noun

    Electricity A closed circuit.

loupe
  1. :: noun

    A small magnifying glass usually set in an eyepiece and used chiefly by watchmakers and jewelers.

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").