Buwal language

The labiodental flap /ⱱ/ is marginal, only occurring in two native Buwal words. The labial-velar plosives are also marginal; in particular, /kp/ only occurs in one word, the ideophone kpaŋ.

Buwal has the vowels /ə a/, which can occur in high, middle, or low tone. Each vowel has a variety of phonetic realizations. /ə/ can occur as [i u ɪ ʏ ʊ], and /a/ can occur as [e o ɛ œ ɐ ɔ]. The schwa can be analyzed as a solely epenthetic vowel. These vowels occur as rounded allophones when adjacent to a labialized consonant, and as front vowels when the word is palatalized.

Palatalization in Buwal occurs across an entire word, and also affects the affricate consonants /ts dz ⁿdz/, which surface as [tʃ dʒ ⁿdʒ] in a palatalized word. As a result, all of the vowels within a single word are either front or back, producing vowel harmony. An example of this contrast is between [mɐ̄ⁿdʊ́wɐ́n] 'rat' (underlyingly /māⁿdwán/), which is non-palatalized, and [mɛ̀vɛ̄ɗvɛ̄ɗɛ̄ŋ] (underlyingly /màvāɗvāɗāŋ/) 'turtle', which is palatalized. This process does not affect loanwords, e.g. [nɛ̀bɐ̄m] 'oil' (from Fulfulde nebbam) or [lɛ̀kʷól] 'school' (from French l'école). Some loanwords have been modified to accommodate Buwal phonology, e.g. [sɐ́j] 'tea', from Fulfulde sha'i.[2]