All vowels (other than /e/ and /o/) can also be nasalized.
All vowels (oral and nasal) can be short or long.
Other linguists include the vowels /ɛ/ and /ɔ/; here, they are analysed as diphthongs, (/ɛ/ is considered to be ea and /ɔ/ is considered to be oa).
Orthography
In Burkina Faso, the Mooré alphabet uses the letters specified in the national Burkinabé alphabet. It can also be written with the newly devised goulsse alphabet.