flew, flue, flu

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

The answer is simple: flew, flue, flu are homophones of the English language.

flew
  1. :: verb

    Past tense of fly1.

flu
  1. :: noun

    Informal Influenza.

flue
  1. :: noun

    A pipe, tube, or channel for conveying hot air, gas, steam, or smoke, as from a furnace or fireplace to a chimney.

  2. :: noun

    Music An organ pipe sounded by means of a current of air striking a lip in the side of the pipe and causing the air within to vibrate. Also called labial.

  3. :: noun

    Music The lipped opening in such a pipe.

  4. :: noun

    A fishing net.

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").