Dipthongs - sounds which consist of a movement of glide from one vowel to another, Bilabial - sounds which the lips are in contact with each other , alveolar ridge - is between the top front teeth and the hard palate, vocoids - sounds which do not obstruct the airflow, dental - sound made with the tongue touching the front teeth, Schwa - it is a central vowel. Its symbol is /ə/,

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