sed, said

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

The answer is simple: sed, said are homophones of the English language.

said
  1. :: verb-transitive

    To utter aloud; pronounce: The children said, "Good morning.”

  2. :: verb-transitive

    To express in words: Say what's on your mind.

  3. :: verb-transitive

    To state as one's opinion or judgment; declare: I say let's eat out.

  4. :: verb-transitive

    To state as a determination of fact: It's hard to say who is right in this matter.

sed
  1. :: verb

    Past tense and past participle of say.

  2. :: adjective

    Law Named or mentioned before; aforementioned: Said party has denied the charges.

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").