summery, summary

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

The answer is simple: summery, summary are homophones of the English language.

summary
  1. :: adjective

    Presenting the substance in a condensed form; concise: a summary review.

  2. :: adjective

    Performed speedily and without ceremony: summary justice; a summary rejection.

  3. :: noun

    A presentation of the substance of a body of material in a condensed form or by reducing it to its main points; an abstract.

summery
  1. :: adjective

    Of, intended for, or suggesting summer.

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").