males, mails

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

The answer is simple: males, mails are homophones of the English language.

mails
  1. :: verb

    Third-person singular simple present indicative form of mail.

  2. :: noun

    Plural form of mail.

  3. :: noun

    The mail delivery system.

males
  1. :: noun

    Plural form of male.

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").