b, d, n, m, u are letters that make 'Umbundu'
MB, bun, UN, Mbundu, Mb, ND, Nd are words within 'Umbundu'
1 possible definitions for 'Umbundu'
Under this definition, umbundu is a noun and has the following properties:
'Umbundu' can be a type of Bantu, Bantoid language.