plumbs, plums

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

The answer is simple: plumbs, plums are homophones of the English language.

plumbs
  1. :: noun

    Plural form of plumb.

  2. :: verb

    Third-person singular simple present indicative form of plumb.

plums
  1. :: noun

    Plural form of plum.

  2. :: verb

    Third-person singular simple present indicative form of plum.

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").