slayed, sleighed

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

The answer is simple: slayed, sleighed are homophones of the English language.

slayed
  1. :: verb

    Simple past tense and past participle of slay.

  2. :: verb

    To become overwhelmed by religious ecstasy.

sleighed
  1. :: verb

    Simple past tense and past participle of sleigh.

Definitions 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").