[m] is shown in parentheses because according to Kroeker (2001), it appears only in loanwords or following the diphthong /au/. In addition to the segments shown above, Nambikwara also has [bm], which appears following the diphthong /ãu/, [ŋ], which appears before a velar stop and after a nasal vowel, [gŋ], which appears before a velar stop and after an oral vowel, and [r], which is an allophone of /l/ that appears following front vowels. Kroeker notes the existence of the voiced alveolar implosive /ɗ/, but argues that it is falling out of use.
Tones[]
Southern Nambikwara is a tonal language with three tones: a falling tone marked with a superscript "1," a rising tone marked "2," and a low tone marked "3." Examples: