grayer, greyer

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

The answer is simple: grayer, greyer are homophones of the English language.

grayer
  1. :: adjective

    comparative form of gray: more gray

greyer
  1. :: adjective

    comparative form of grey: more grey

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").