poring, pouring

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

The answer is simple: poring, pouring are homophones of the English language.

poring
  1. :: verb

    Present participle of pore.

pouring
  1. :: verb

    Present participle of pour.

  2. :: noun

    The act by which something is poured.

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").