Ajumbu (ISO 639-3: muc) is a variety of Yemne-Kimbi (Good et al 2011) spoken in Lower Fungom in Fungom Subdivision in Menchum Division in the North West Region of Cameroon. Ajumbu is a tonal language with noun class affixes. A presentation of the noun classes of Ajumbu can be seen in (Good et al 2011:137) while tentative noun classes, shows more sample words per noun class. There is ongoing research to sieve out words which purely belong to gender 5/6 from gender 9/10 which for now they have been collapsed in 5/6 due to a unique concord system existing for both gender 5/6 and 9/10 ( y- / y-) in Ajumbu. We shall greatly rely on the nature of the nominal prefixes, concord and the tonal patterns to separate the genders.