"Meat of wildebeest is delicious"
Translation:Nyama ya nyumbu ni tamu
First, we are talking about two different nouns, "nyama" and "nyumbu" and therefore these two nouns may take different agreements. Then, we are talking about two different parts of speech: 1) the "-a" of possession or association of, and 2) the possessive adjectives "-angu", "-ako", "-ake", "-etu", "-enu", "-ao" my, your, his/her/its, our, your, their. Frequently there is a similarity between the two (nyumba ya mwalimu; nyumba yake), but sometimes there is not; this is especially true with nouns that represent people and animals, such as "nyumbu". That is a partial answer. Try to find a Swahili grammar book or grammar reference online and see if you can work out the details.