grill, grille

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

The answer is simple: grill, grille are homophones of the English language.

grill
  1. :: noun

    Variant of grille.

  2. :: noun

    A series of marks grilled or embossed on a surface.

  3. :: noun

    A grillroom.

  4. :: noun

    Food cooked by broiling or grilling.

grille
  1. :: noun

    An opening covered with a grating.

  2. :: noun

    A grating of metal, wood, or another material used as a screen, divider, barrier, or decorative element, as in a window or on the front end of an automotive vehicle.

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").