moo, moue, mu

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

The answer is simple: moo, moue, mu are homophones of the English language.

moo
  1. :: intransitive verb

    To emit the deep, bellowing sound made by a cow; low.

  2. :: noun

    The lowing of a cow or a similar sound.

  3. ::

    An obsolete form of <internalXref urlencoded="mo">mo</internalXref>.

  4. ::

    To utter the characteristic cry of a cow; low.

moue
  1. :: noun

    A small grimace; a pout.

  2. :: noun

    a disdainful grimace

mu
  1. :: noun

    The 12th letter of the Greek alphabet.

  2. :: noun

    The Greek letter M. <bt>μ (μῦ</bt>, earlier <bt>μῶ)</bt>, corresponding to the English <em>M, m.</em> See <internalXref urlencoded="M">M</internalXref> and <internalXref urlencoded="mem">mem</internalXref>.

  3. :: noun

    The Greek letter <bt>μ</bt>, corresponding to the English <em>masculine</em>

  4. :: noun

    The 12th letter of the Greek alphabet (μ, Μ).

Definitions from The American Heritage® Dictionary of the English Language, 5th Edition., from The Century Dictionary., from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved., from the GNU version of the Collaborative International Dictionary of English. 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").