wailed, whaled

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

The answer is simple: wailed, whaled are homophones of the English language.

wailed
  1. :: noun

    A loud, bitter protest: A wail of misery went up when new parking restrictions were announced.

  2. :: noun

    A long, loud, high-pitched sound: the wail of a siren.

  3. :: noun

    A long, loud, high-pitched cry, as of grief or pain.

  4. :: verb-transitive

    Archaic To lament over; bewail.

whaled
  1. :: verb

    Third-person singular simple present indicative form of whale.

  2. :: noun

    Plural form of whale.

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").