Southern Tiwa has 26 consonants:
Consonants Bilabial Dental Lateral Alveolar Palatal Velar Glottal plain lab. Plosive voiced b d ɡ voiceless p t k kʷ ʔ aspirated pʰ tʰ kʰ glottalized pʼ tʼ kʼ kʷʼ Affricate voiceless tʃ glottalized tʃʼ Fricative f ɬ s ʃ h hʷ Trill r Nasal m n Approximant w l j
Southern Tiwa has six vowels that have both an oral and nasal contrast.
Southern Tiwa has three tones: high, mid, and low.