prose, pros

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

The answer is simple: prose, pros are homophones of the English language.

pros
  1. :: noun

    Plural form of pro.

prose
  1. :: noun

    Ordinary speech or writing, without metrical structure.

  2. :: noun

    Commonplace expression or quality.

  3. :: noun

    Roman Catholic Church A hymn of irregular meter sung before the Gospel.

  4. :: verb-intransitive

    To write prose.

Definitions from Wiktionary, Creative Commons Attribution/Share-Alike License, 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").