#vowel_sound__vowelsound__vowel  a speech sound made with the vocal tract open
  exclusion:  #consonant
  supertype:  #speech_sound__phone__sound  (linguistics) an individual sound unit of speech without concern as to whether or not it is a phoneme of some language
  subtype:  #ablaut__gradation  a vowel whose quality or length is changed to indicate linguistic distinctions (such as sing sang sung song)
  subtype:  #diphthong  a vowel sound that starts near the articulatory position for one vowel and moves toward the position for another
  subtype:  #schwa__shwa  a neutral middle vowel; occurs in unstressed syllables
     subtype:  #murmur_vowel__murmur  a schwa that is incidental to the pronunciation of a consonant
  subtype:  #stem_vowel__thematic_vowel  a vowel that ends a stem and precedes an inflection

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