What this means for learners
Wubuy and Adzera share 9 sounds — roughly 36% of Adzera's inventory overlaps with Wubuy. Shared sounds are ones a speaker already knows from their native language and will generally produce and perceive accurately without explicit training.
The 16 sounds found only in Adzera represent the greatest pronunciation challenge for Wubuy speakers. The adult brain tends to map unfamiliar sounds onto the closest native equivalent — a process that produces the characteristic "accent" of a second-language speaker. Learning to hear and produce these sounds as distinct requires focused ear training, not just repetition.
Conversely, Wubuy has 16 sounds not used in Adzera. Native Adzera speakers learning Wubuy will face the mirror-image challenge with these sounds.
Phoneme inventories from PHOIBLE. Data reflects one documented inventory per language; some variation exists across dialects and sources.