To know how to say "spear" in a particular African language, you need to specify which language you're interested in.
For example:
* Swahili: *Mkuki*
* Yoruba: *Ofá*
* Zulu: *Umkhonto*
* Amharic: *ነጥቃ* (neṭqa)
If you tell me the specific African language you're looking for, I can help you find the right word!