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Amba (also spelled Bulebule, Hamba, Humu, Kihumu, Ku-Amba, Kuamba, Lubulebule, Lwamba, Ruwenzori Kibira, and Rwamba) is a language spoken in parts of Uganda and the Democratic Republic of Congo by the Amba people. The Amba people call it Kwamba and it is known as Kihumu in the Democratic Republic of the Congo. Amba has a 70% lexical similarity with Bera. Dialects include Kyanzi (Kihyanzi) and Suwa (Kusuwa).
There was once an Amba pidgin called Vamba, now extinct.
References
Amba at Ethnologue (18th ed., 2015) (subscription required)