The words whaled, wailed sound the same but have different meanings and spellings. Why do whaled, wailed sound the same even though they are completely different words?
The answer is simple: whaled, wailed are homophones of the English language.
A loud, bitter protest: A wail of misery went up when new parking restrictions were announced.
A long, loud, high-pitched sound: the wail of a siren.
A long, loud, high-pitched cry, as of grief or pain.
Archaic To lament over; bewail.
Third-person singular simple present indicative form of whale.
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.
Homophones (literally "same sound") are usually defined as words that share the same pronunciation, regardless of how they are spelled.