Allophones Any phone that counts as the same phoneme in a language - variants of the same phoneme. Using a different allophone does not change meaning. [t], [tj ], [tw], [th ], are allophones of /t/.
glottal stopGlottal stop or glottal plosive is a type of consonantal sound produced by obstructing airflow in the vocal tract or, more precisely, the glottis.