We don't have synonyms for unguja yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are ungula.
(N) :
(also referred to as "Zanzibar Island" or simply "Zanzibar", in – as mentioned in The Periplus of the Erythraean Sea) the largest and most populated island of the Zanzibar archipelago, in Tanzania.
(N) :
(also referred to as "Zanzibar Island" or simply "Zanzibar", in – as mentioned in The Periplus of the Erythraean Sea) the largest and most populated island of the Zanzibar archipelago, in Tanzania.