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How are front vowels different from back vowels?

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Diagram of a human head in profile showing the location of vocal organs and possible places of articulation for speech sounds, with labels for lips, teeth, tongue, palate, uvula, pharynx, and vocal cords, and numbered regions corresponding to types of articulation such as bilabial, alveolar, and velar.
phonetics Diagram depicting the location of human vocal organs and possible places of articulation used for speech.

In articulatory phonetics, vowels are classified by the position of the highest point of the tongue within the mouth. The primary distinction between front and back vowels involves the following:

  • Front Vowels: These are produced with the highest part of the tongue pushed forward and arched toward the front of the mouth. Examples include the vowels in heed, hid, head, and had.12
  • Back Vowels: These are produced with the back part of the tongue raised toward the soft palate (velum). Examples include the vowels in hod, hawed, hood, and who’d.12

While this classification is traditional, it is an oversimplification. The shape of the tongue as a whole differs significantly between these categories, and the width of the pharynx also varies independently of tongue height. Furthermore, while many languages exhibit a tendency for front vowels to be unrounded and back vowels to be rounded, this is not a universal rule; many languages, such as French and German, utilize front rounded vowels.1